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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-((7*x)/x) = 5/7 // - 5/7
1-((7*x)/x)-(5/7) = 0
1-5/7-7 = 0
-47/7 = 0
x belongs to the empty set
x belongs to the empty set
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