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