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D( x )
9*x^17*y^-3 = 0
9*x^17*y^-3 = 0
9*x^17*y^-3 = 0
9*x^17*y^-3 = 0 // : 9*y^-3
x^17 = 0
x = 0
x in (-oo:0) U (0:+oo)
((18*x^12*y^7)/(9*x^17*y^-3))^3 = 0
8*x^-15*y^30 = 0 // : 8*y^30
x^-15 = 0
x naleu017Cy do O
x belongs to the empty set
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