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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+7)/(x-6) = 0
x+7 = 0 // - 7
x = -7
x = -7
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