Answer:
The variable (x) is -1.
Explanation:
use the distributive property
-3(x - 1) + 9 = 15
-3x + 3 + 9 = 15
-3x + 12 = 15
-12 -12
-3x = 3
divide by -3
x = -1
-3(x-1) + 9 = 15
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