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D( x )
-x-2 = 0
x-1 = 0
-x-2 = 0
-x-2 = 0
-x-2 = 0 // + 2
-x = 2 // * -1
x = -2
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-2) U (-2:1) U (1:+oo)
(x-6)/(-x-2) = (x+3)/(x-1) // - (x+3)/(x-1)
(x-6)/(-x-2)-((x+3)/(x-1)) = 0
(x-6)/(-x-2)+(-1*(x+3))/(x-1) = 0
((x-6)*(x-1))/((-x-2)*(x-1))+(-1*(x+3)*(-x-2))/((-x-2)*(x-1)) = 0
(x-6)*(x-1)-1*(x+3)*(-x-2) = 0
2*x^2-2*x+12 = 0
2*x^2-2*x+12 = 0
2*(x^2-x+6) = 0
x^2-x+6 = 0
DELTA = (-1)^2-(1*4*6)
DELTA = -23
DELTA < 0
2 = 0
2/((-x-2)*(x-1)) = 0
2/((-x-2)*(x-1)) = 0 // * (-x-2)*(x-1)
2 = 0
x belongs to the empty set
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