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D( x )
(7*x^1)/4 = 0
(7*x^1)/4 = 0
(7*x^1)/4 = 0
(7*x)/4 = 0
7/4*x = 0 // : 7/4
x = 0
x in (-oo:0) U (0:+oo)
((35*x^1)/2)/((7*x^1)/4) = 0
((35*x)/2)/((7*x)/4) = 0
10 = 0
x belongs to the empty set
x belongs to the empty set
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