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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4*((x^-3)/36) = 0
1/36*x^-7 = 0 // : 1/36
x^-7 = 0
x naleu017Cy do O
x belongs to the empty set
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