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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)
(35*x^2)/(-7*x) = 0
-5*x = 0 // : -5
x = 0
x in { 0}
x belongs to the empty set
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