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D( x )
14*w^5*x^5 = 0
14*w^5*x^5 = 0
14*w^5*x^5 = 0
14*w^5*x^5 = 0 // : 14*w^5
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(18*w^4*x^9)/(14*w^5*x^5) = 0
9/7*w^-1*x^4 = 0 // : 9/7*w^-1
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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