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