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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)-(3/(x-1)) = 1 // - 1
x/(x-2)-(3/(x-1))-1 = 0
x/(x-2)-3*(x-1)^-1-1 = 0
x/(x-2)-3/(x-1)-1 = 0
(x*(x-1))/((x-2)*(x-1))+(-3*(x-2))/((x-2)*(x-1))+(-1*(x-2)*(x-1))/((x-2)*(x-1)) = 0
x*(x-1)-3*(x-2)-1*(x-2)*(x-1) = 0
x^2-x^2-4*x+3*x-2+6 = 0
4-x = 0
(4-x)/((x-2)*(x-1)) = 0
(4-x)/((x-2)*(x-1)) = 0 // * (x-2)*(x-1)
4-x = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x = 4
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