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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((5/2)*x)/1)/x = 6 // - 6
(((5/2)*x)/1)/x-6 = 0
((5/2)*x)/x-6 = 0
-7/2 = 0
x belongs to the empty set
x belongs to the empty set
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