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3*(4*x-3) = -129 // + 129
3*(4*x-3)+129 = 0
3*(4*x-3)+129 = 0
12*x+120 = 0
12*x+120 = 0
12*x+120 = 0 // - 120
12*x = -120 // : 12
x = -120/12
x = -10
x = -10
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