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(9*(x-4))/3 = (6*(x+1))/12 // - (6*(x+1))/12
(9*(x-4))/3-((6*(x+1))/12) = 0
(9*(x-4))/3+(-1/2)*(x+1) = 0
(9*(x-4))/3-1/2*(x+1) = 0
(9*(x-4))/3+(-1/2*3*(x+1))/3 = 0
9*(x-4)-1/2*3*(x+1) = 0
15/2*x-75/2 = 0
(15/2*x-75/2)/3 = 0
(15/2*x-75/2)/3 = 0 // * 3
15/2*x-75/2 = 0
15/2*x-75/2 = 0 // + 75/2
15/2*x = 75/2 // : 15/2
x = 75/2/15/2
x = 5
x = 5
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