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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+1)-(4/(x-2)) = 2 // - 2
x/(x+1)-(4/(x-2))-2 = 0
x/(x+1)-4*(x-2)^-1-2 = 0
x/(x+1)-4/(x-2)-2 = 0
(x*(x-2))/((x+1)*(x-2))+(-4*(x+1))/((x+1)*(x-2))+(-2*(x+1)*(x-2))/((x+1)*(x-2)) = 0
x*(x-2)-4*(x+1)-2*(x+1)*(x-2) = 0
x^2-2*x^2-6*x+2*x-4+4 = 0
-x^2-4*x = 0
-x^2-4*x = 0
-x*(x+4) = 0
x+4 = 0 // - 4
x = -4
-x*(x+4) = 0
(-x*(x+4))/((x+1)*(x-2)) = 0
(-x*(x+4))/((x+1)*(x-2)) = 0 // * (x+1)*(x-2)
-x*(x+4) = 0
( -x )
-1*x = 0 // : -1
x = 0
( x+4 )
x+4 = 0 // - 4
x = -4
x in { 0, -4 }
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