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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)
4/(x-1)-(3/(x-2)) = -1 // + 1
4/(x-1)-(3/(x-2))+1 = 0
4/(x-1)-3*(x-2)^-1+1 = 0
4/(x-1)-3/(x-2)+1 = 0
(4*(x-2))/((x-1)*(x-2))+(-3*(x-1))/((x-1)*(x-2))+(1*(x-1)*(x-2))/((x-1)*(x-2)) = 0
4*(x-2)-3*(x-1)+1*(x-1)*(x-2) = 0
x^2+x-3*x-5+2 = 0
x^2-2*x-3 = 0
x^2-2*x-3 = 0
x^2-2*x-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(1*2) or x = (2-16^(1/2))/(1*2)
x = 3 or x = -1
(x+1)*(x-3) = 0
((x+1)*(x-3))/((x-1)*(x-2)) = 0
((x+1)*(x-3))/((x-1)*(x-2)) = 0 // * (x-1)*(x-2)
(x+1)*(x-3) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -1, 3 }
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