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(x-6)/3-((x-27)/9) = 3 // - 3
(x-6)/3-((x-27)/9)-3 = 0
(x-6)/3+(-1*(x-27))/9-3 = 0
(9*(x-6))/(3*9)+(-1*3*(x-27))/(3*9)+(-3*3*9)/(3*9) = 0
9*(x-6)-1*3*(x-27)-3*3*9 = 0
6*x-81+27 = 0
6*x-54 = 0
(6*x-54)/(3*9) = 0
(6*x-54)/(3*9) = 0 // * 3*9
6*x-54 = 0
6*x-54 = 0 // + 54
6*x = 54 // : 6
x = 54/6
x = 9
x = 9
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