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