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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((7*x^-3)/16)*x^-1 = 0
7/16*x^-4 = 0 // : 7/16
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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