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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)
(2*x-3)/(x+1)-1 = 0
(2*x-3)/(x+1)+(-1*(x+1))/(x+1) = 0
2*x-1*(x+1)-3 = 0
x-4 = 0
(x-4)/(x+1) = 0
(x-4)/(x+1) = 0 // * x+1
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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