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D( x )
x = 0
((7*x^-3)/8)*y^-5 = 0
x = 0
x = 0
((7*x^-3)/8)*y^-5 = 0
((7*x^-3)/8)*y^-5 = 0
7/8*x^-3*y^-5 = 0 // : 7/8*y^-5
x^-3 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(((7*x^-3)/8)*y^-5)^-3 = 0
512/343*x^9*y^15 = 0 // : 512/343*y^15
x^9 = 0
x = 0
x in { 0}
x belongs to the empty set
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