To solve the equation \( 17 = 9 - a \), we need to isolate the variable \( a \). Here’s how we do it:

1. Start with the equation:
   \[
   17 = 9 - a
   \]

2. Subtract 9 from both sides to move the constant to the left side:
   \[
   17 - 9 = -a
   \]

3. Simplify the left side:
   \[
   8 = -a
   \]

4. Finally, multiply both sides by \(-1\) to solve for \( a \):
   \[
   a = -8
   \]

So, the solution is \( a = -8 \).

Would you like any more details or have any questions? Here are some related problems you might find interesting:

1. Solve \( 5 = 3 - x \).
2. Solve \( 20 = 12 - b \).
3. Solve \( 25 = 10 - c \).
4. Solve \( 30 = 15 - d \).
5. Solve \( 40 = 25 - e \).

**Tip:** When solving equations, the goal is to isolate the variable on one side of the equation.

Learn how to solve the equation 17 = 9 - a with a detailed step-by-step solution. This problem covers key algebraic concepts, including linear equations and isolating variables. Suitable for students in Grades 6-8.

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