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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/(-x) = 1/5 // - 1/5
(5*x)/(-x)-(1/5) = 0
(5*x)/(-x)-1/5 = 0
-26/5 = 0
x belongs to the empty set
x belongs to the empty set
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