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D( x )
7*x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/(7*x)-49 = 0
-338/7 = 0
x belongs to the empty set
x belongs to the empty set
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