(9x^7/y)^-3

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Solution for (9x^7/y)^-3 equation: 


D( x )

(9*x^7)/y = 0

(9*x^7)/y = 0

(9*x^7)/y = 0

9*x^7*y^-1 = 0 // : 9*y^-1

x^7 = 0

x = 0

x in (-oo:0) U (0:+oo)

((9*x^7)/y)^-3 = 0

1/729*x^-21*y^3 = 0 // : 1/729*y^3

x^-21 = 0

x należy do O

x belongs to the empty set

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