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