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(3/4)*(x-4) = 39 // - 39
(3/4)*(x-4)-39 = 0
3/4*(x-4)-39 = 0
3/4*(x-4)-39 = 0
3/4*x-42 = 0
3/4*x-42 = 0
3/4*x-42 = 0 // + 42
3/4*x = 42 // : 3/4
x = 42/3/4
x = 56
x = 56
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