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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-(5*x)-8)/(x-3) = 0
(X^2-5*x-8)/(x-3) = 0
X^2-5*x-8 = 0 // - X^2-8
-5*x = -(X^2-8) // : -5
x = (-(X^2-8))/(-5)
x = (8-X^2)/(-5)
x = (8-X^2)/(-5)
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