Answer:
x = 15 is your solution.
Step-by-step explanation:
To find out what your answer is, plug in the given solutions for the variable, x, in the given equation:
When x = 9:
x - 3 = 12
(9) - 3 = 12
6 ≠ 12
When x = 15:
x - 3 = 12
(15) - 3 = 12
12 = 12
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