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D( x )
x+2 = 0
(x-3)/(x+2) = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
(x-3)/(x+2) = 0
(x-3)/(x+2) = 0
x-3 = 0 // + 3
x = 3
x in (-oo:-2) U (-2:3) U (3:+oo)
(X^2-x-6)/((x-3)/(x+2)) = 0
((X^2-x-6)*(x+2))/(x-3) = 0
( X^2-x-6 )
X^2-x-6 = 0 // - X^2-6
-x = -(X^2-6) // * -1
x = X^2-6
( x+2 )
x+2 = 0 // - 2
x = -2
x in { -2}
x = X^2-6
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