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D( x )
x-5 = 0
5*x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:5) U (5:+oo)
(8*(7/(x-5)))/(5*x) = 0
(7*8)/(5*x*(x-5)) = 0
( 7 )
7 = 0
x belongs to the empty set
( 8 )
8 = 0
x belongs to the empty set
x belongs to the empty set
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