Algebra-1

Question Analysis
This question tests the student's ability to solve a one-step equation involving addition. The problem requires the student to isolate the variable by adding 9 to both sides of the equation.

Key Concept Explanation
The key concept here is the use of inverse operations to isolate the variable. In this case, the inverse operation of subtraction is addition.

Step-by-step Solution
1. Start with the equation:
2. Add 9 to both sides:

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