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The image contains a set of algebraic expressions that require simplification. Let's go through each question one by one:

1. **Sederhanakan bentuk \( 9 + 7x - 1 \)**:
   - Combine like terms: 
     \[
     9 - 1 = 8
     \]
     So, the simplified form is:
     \[
     7x + 8
     \]

2. **Sederhanakan bentuk \( 7x - 8x + 12 \)**:
   - Combine like terms:
     \[
     7x - 8x = -x
     \]
     So, the simplified form is:
     \[
     -x + 12
     \]

3. **Sederhanakan bentuk \( 7 - 2x - x + 5 \)**:
   - Combine like terms:
     \[
     -2x - x = -3x
     \]
     \[
     7 + 5 = 12
     \]
     So, the simplified form is:
     \[
     -3x + 12
     \]

4. **Sederhanakan bentuk \( 9a + 2a + 5 + 3 \)**:
   - Combine like terms:
     \[
     9a + 2a = 11a
     \]
     \[
     5 + 3 = 8
     \]
     So, the simplified form is:
     \[
     11a + 8
     \]

5. **Sederhanakan bentuk operasi aljabar \( 7c + 2c + 6 - 6 \)**:
   - Combine like terms:
     \[
     7c + 2c = 9c
     \]
     \[
     6 - 6 = 0
     \]
     So, the simplified form is:
     \[
     9c
     \]

6. **Sederhanakan bentuk operasi aljabar \( 6a + 7b + 5c + 2a - 3b + 7c \)**:
   - Combine like terms:
     \[
     6a + 2a = 8a
     \]
     \[
     7b - 3b = 4b
     \]
     \[
     5c + 7c = 12c
     \]
     So, the simplified form is:
     \[
     8a + 4b + 12c
     \]

7. **Sederhanakan bentuk operasi aljabar \( 5a - 6b + 12a + 10b - 3 \)**:
   - Combine like terms:
     \[
     5a + 12a = 17a
     \]
     \[
     -6b + 10b = 4b
     \]
     The constant term is \(-3\).
     So, the simplified form is:
     \[
     17a + 4b - 3
     \]

8. **Sederhanakan bentuk operasi aljabar \( 8m - 3n + 1 - 2m + 10n - 5 \)**:
   - Combine like terms:
     \[
     8m - 2m = 6m
     \]
     \[
     -3n + 10n = 7n
     \]
     \[
     1 - 5 = -4
     \]
     So, the simplified form is:
     \[
     6m + 7n - 4
     \]

9. **Sederhanakan bentuk operasi aljabar \( 2c + 3x - 5m + 2c + 3x + 5 \)**:
   - Combine like terms:
     \[
     2c + 2c = 4c
     \]
     \[
     3x + 3x = 6x
     \]
     The constant term is \(+5\).
     So, the simplified form is:
     \[
     4c + 6x - 5m + 5
     \]

10. **Sederhanakan bentuk operasi aljabar \( 4c + 3m - 2 - 2(4m - 5) \)**:
    - Expand the expression:
      \[
      -2(4m - 5) = -8m + 10
      \]
    - Combine like terms:
      \[
      4c + 3m - 2 - 8m + 10
      \]
      \[
      3m - 8m = -5m
      \]
      \[
      -2 + 10 = 8
      \]
      So, the simplified form is:
      \[
      4c - 5m + 8
      \]

Would you like more details on any of the steps, or do you have any questions? Here are 5 questions to expand on this:

1. How do you handle like terms in algebraic expressions?
2. What is the process of distributing multiplication over subtraction?
3. Can algebraic expressions be simplified further when there are no like terms?
4. What are the rules for combining constants in an expression?
5. How do you simplify expressions with multiple variables and constants?

**Tip**: Always start by identifying and grouping like terms to simplify expressions efficiently!

Learn how to simplify algebraic expressions with multiple variables and constants. This set of problems includes combining like terms, using distributive properties, and handling variables. Suitable for students in Grades 7-9.

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