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4*x-12 = (1/3)*(51-(17*x)) // - (1/3)*(51-(17*x))
4*x-((1/3)*(51-(17*x)))-12 = 0
(-1/3)*(51-17*x)+4*x-12 = 0
4*x-1/3*(51-17*x)-12 = 0
4*x-1/3*(51-17*x)-12 = 0
29/3*x-17-12 = 0
29/3*x-29 = 0
29/3*x-29 = 0
29/3*x-29 = 0 // + 29
29/3*x = 29 // : 29/3
x = 29/29/3
x = 3
x = 3
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