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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)
1/(x-2)-(1/(x-1)) = 1/6 // - 1/6
1/(x-2)-(1/(x-1))-(1/6) = 0
1/(x-2)-(x-1)^-1-1/6 = 0
1/(x-2)-1/(x-1)-1/6 = 0
(1*6*(x-1))/(6*(x-2)*(x-1))+(-1*6*(x-2))/(6*(x-2)*(x-1))+(-1*(x-2)*(x-1))/(6*(x-2)*(x-1)) = 0
1*6*(x-1)-1*6*(x-2)-1*(x-2)*(x-1) = 0
3*x-x^2-2+6 = 0
3*x-x^2+4 = 0
3*x-x^2+4 = 0
3*x-x^2+4 = 0
DELTA = 3^2-(-1*4*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-3)/(-1*2) or x = (-25^(1/2)-3)/(-1*2)
x = -1 or x = 4
(x+1)*(x-4) = 0
((x+1)*(x-4))/(6*(x-2)*(x-1)) = 0
((x+1)*(x-4))/(6*(x-2)*(x-1)) = 0 // * 6*(x-2)*(x-1)
(x+1)*(x-4) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -1, 4 }
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