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