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(x-4)/7 = (8-(3*x))/7 // - (8-(3*x))/7
(x-4)/7-((8-(3*x))/7) = 0
(x-4)/7-((8-3*x)/7) = 0
(x-4)/7+(-1*(8-3*x))/7 = 0
x-1*(8-3*x)-4 = 0
4*x-12 = 0
(4*x-12)/7 = 0
(4*x-12)/7 = 0 // * 7
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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