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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)
(9-x)/(x+6) = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
x = 9
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