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D( x )
(5*x^7*y)/(6*a^-1*b^-9) = 0
6*a^-1*b^-9 = 0
(5*x^7*y)/(6*a^-1*b^-9) = 0
(5*x^7*y)/(6*a^-1*b^-9) = 0
5/6*a*b^9*x^7*y = 0 // : 5/6*a*b^9*y
x^7 = 0
x = 0
6*a^-1*b^-9 = 0
6*a^-1*b^-9 = 0
6*a^-1*b^-9 = 0
x należy do R
x belongs to the empty set
((5*x^7*y)/(6*a^-1*b^-9))^-1 = 0
x belongs to the empty set
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