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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(9*x)/(x-4) = 0
9*x = 0 // : 9
x = 0
x = 0
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