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D( x )
x-3 = 0
x+1 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:3) U (3:+oo)
(x-2)/(x-3) = (x-2)/(x+1) // - (x-2)/(x+1)
(x-2)/(x-3)-((x-2)/(x+1)) = 0
(x-2)/(x-3)+(-1*(x-2))/(x+1) = 0
((x-2)*(x+1))/((x-3)*(x+1))+(-1*(x-2)*(x-3))/((x-3)*(x+1)) = 0
(x-2)*(x+1)-1*(x-2)*(x-3) = 0
4*x-8 = 0
(4*x-8)/((x-3)*(x+1)) = 0
(4*x-8)/((x-3)*(x+1)) = 0 // * (x-3)*(x+1)
4*x-8 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x = 2
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