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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
(X^2+5*x+6)/(x+1) = 0
X^2+5*x+6 = 0 // - X^2+6
5*x = -(X^2+6) // : 5
x = (-(X^2+6))/5
x = (-(X^2+6))/5
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