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D( x )
x-2 = 0
x+1 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:2) U (2:+oo)
x/(x-2)-(1/(x+1)) = 1 // - 1
x/(x-2)-(1/(x+1))-1 = 0
x/(x-2)-(x+1)^-1-1 = 0
x/(x-2)-1/(x+1)-1 = 0
(x*(x+1))/((x-2)*(x+1))+(-1*(x-2))/((x-2)*(x+1))+(-1*(x-2)*(x+1))/((x-2)*(x+1)) = 0
x*(x+1)-1*(x-2)-1*(x-2)*(x+1) = 0
x^2-x^2+x+2+2 = 0
x+4 = 0
(x+4)/((x-2)*(x+1)) = 0
(x+4)/((x-2)*(x+1)) = 0 // * (x-2)*(x+1)
x+4 = 0
x+4 = 0 // - 4
x = -4
x = -4
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