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(3/4)*(12*x-8) = -18 // + 18
(3/4)*(12*x-8)+18 = 0
3/4*(12*x-8)+18 = 0
3/4*(12*x-8)+18 = 0
9*x+12 = 0
9*x+12 = 0
9*x+12 = 0 // - 12
9*x = -12 // : 9
x = -12/9
x = -4/3
x = -4/3
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