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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+6*x-4+4 = 0
-x^2 = 0
(-x^2)/((x-1)*(x-2)) = 0
(-x^2)/((x-1)*(x-2)) = 0 // * (x-1)*(x-2)
-x^2 = 0
-1*x^2 = 0 // : -1
x^2 = 0
x = 0
x = 0
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