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D( x )
x-7 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:7) U (7:+oo)
(4*x)/(x-7) = 0
4*x = 0 // : 4
x = 0
x = 0
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