To solve the equation:

\[
d + 8 = -d - 10
\]

### Step 1: Move all terms with \( d \) to one side.

Add \( d \) to both sides:
\[
d + d + 8 = -10
\]
\[
2d + 8 = -10
\]

### Step 2: Move the constant term on the left to the right.

Subtract 8 from both sides:
\[
2d = -10 - 8
\]
\[
2d = -18
\]

### Step 3: Solve for \( d \).

Divide both sides by 2:
\[
d = \frac{-18}{2} = -9
\]

### Final Answer:
\[
d = -9
\]

Let me know if you need any further clarification! Here are 5 related questions:

1. How do you solve linear equations involving variables on both sides?
2. What steps are important in isolating the variable?
3. How do you verify that your solution is correct?
4. What happens when the equation involves fractions or decimals?
5. How do you deal with equations where the variable cancels out?

**Tip:** Always move the variable terms to one side first, then handle the constant terms next!

Learn how to solve the equation d + 8 = -d - 10 with a detailed step-by-step solution. This problem involves linear equations where variables are on both sides. Suitable for students in Grades 7-9.

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