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