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D( x )
x-16 = 0
x-16 = 0
x-16 = 0
x-16 = 0 // + 16
x = 16
x in (-oo:16) U (16:+oo)
(x-7)/(x-16) = 0
x-7 = 0 // + 7
x = 7
x = 7
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