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