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x in (-oo:+oo)
(3*(x+1))/6 = 2*x-1 // - 2*x-1
(3*(x+1))/6-(2*x)+1 = 0
(3*(x+1))/6-2*x+1 = 0
(3*(x+1))/6+(-2*6*x)/6+(1*6)/6 = 0
3*(x+1)-2*6*x+1*6 = 0
3-9*x+6 = 0
9-9*x = 0
(9-9*x)/6 = 0
(9-9*x)/6 = 0 // * 6
9-9*x = 0
9-9*x = 0 // - 9
-9*x = -9 // : -9
x = -9/(-9)
x = 1
x = 1
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