9x - 3(2x + 2) = 15
9x - 6x - 6 = 15
3x - 6 = 15
3x = 21
x = 7
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9x - 3(2x + 2) = 15
9x - 6x - 6 = 15
3x - 6 = 15
3x = 21
x = 7