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x in (-oo:+oo)
(3*(x-12))/4 = 120 // - 120
(3*(x-12))/4-120 = 0
(3*(x-12))/4+(-120*4)/4 = 0
3*(x-12)-120*4 = 0
3*x-516 = 0
(3*x-516)/4 = 0
(3*x-516)/4 = 0 // * 4
3*x-516 = 0
3*x-516 = 0 // + 516
3*x = 516 // : 3
x = 516/3
x = 172
x = 172
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