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D( x )
(7*x^9)/y = 0
(7*x^9)/y = 0
(7*x^9)/y = 0
7*x^9*y^-1 = 0 // : 7*y^-1
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
((7*x^9)/y)^-3 = 0
1/343*x^-27*y^3 = 0 // : 1/343*y^3
x^-27 = 0
x należy do O
x belongs to the empty set
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