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