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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)
(x-3)/(x+6) = 0
x-3 = 0 // + 3
x = 3
x = 3
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