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(3/4)*(12*x+32) = 99 // - 99
(3/4)*(12*x+32)-99 = 0
3/4*(12*x+32)-99 = 0
3/4*(12*x+32)-99 = 0
9*x-75 = 0
9*x-75 = 0
9*x-75 = 0 // + 75
9*x = 75 // : 9
x = 75/9
x = 25/3
x = 25/3
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