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D( x )
x+9 = 0
x+9 = 0
x+9 = 0
x+9 = 0 // - 9
x = -9
x in (-oo:-9) U (-9:+oo)
(x-7)/(x+9) = 0
x-7 = 0 // + 7
x = 7
x = 7
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