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x in (-oo:+oo)
(1/2)*(x+1) = (1/3)*(x-1) // - (1/3)*(x-1)
(1/2)*(x+1)-((1/3)*(x-1)) = 0
(1/2)*(x+1)+(-1/3)*(x-1) = 0
1/2*(x+1)-1/3*(x-1) = 0
1/2*(x+1)-1/3*(x-1) = 0
1/6*x+5/6 = 0
1/6*x+5/6 = 0
1/6*x+5/6 = 0 // - 5/6
1/6*x = -5/6 // : 1/6
x = -5/6/1/6
x = -5
x = -5
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