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3*(x-4) = 39/19 // - 39/19
3*(x-4)-(39/19) = 0
3*(x-4)-39/19 = 0
(3*19*(x-4))/19-39/19 = 0
3*19*(x-4)-39 = 0
57*x-267 = 0
(57*x-267)/19 = 0
(57*x-267)/19 = 0 // * 19
57*x-267 = 0
57*x-267 = 0 // + 267
57*x = 267 // : 57
x = 267/57
x = 89/19
x = 89/19
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