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