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D( x )
x = 0
((6*x^-3)/7)*y^-1 = 0
x = 0
x = 0
((6*x^-3)/7)*y^-1 = 0
((6*x^-3)/7)*y^-1 = 0
6/7*x^-3*y^-1 = 0 // : 6/7*y^-1
x^-3 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((6*x^-3)/7)*y^-1)^-2 = 0
49/36*x^6*y^2 = 0 // : 49/36*y^2
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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