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(3/4)*(5*x+4) = 12 // - 12
(3/4)*(5*x+4)-12 = 0
3/4*(5*x+4)-12 = 0
3/4*(5*x+4)-12 = 0
15/4*x-9 = 0
15/4*x-9 = 0
15/4*x-9 = 0 // + 9
15/4*x = 9 // : 15/4
x = 9/15/4
x = 12/5
x = 12/5
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