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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:-2) U (-2:1) U (1:+oo)
5/(x+2)-(3/(x-1)) = 0
5/(x+2)-3*(x-1)^-1 = 0
5/(x+2)-3/(x-1) = 0
(5*(x-1))/((x+2)*(x-1))+(-3*(x+2))/((x+2)*(x-1)) = 0
5*(x-1)-3*(x+2) = 0
2*x-11 = 0
(2*x-11)/((x+2)*(x-1)) = 0
(2*x-11)/((x+2)*(x-1)) = 0 // * (x+2)*(x-1)
2*x-11 = 0
2*x-11 = 0 // + 11
2*x = 11 // : 2
x = 11/2
x = 11/2
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