1/27=x^-3

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Solution for 1/27=x^-3 equation: 


D( x )

x = 0

x = 0

x = 0

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

1/27 = x^-3 // - x^-3

1/27-x^-3 = 0

-1*x^-3 = -1/27 // : -1

x^-3 = 1/27

-3 < 0

1/(x^3) = 1/27 // * x^3

1 = 1/27*x^3 // : 1/27

27 = x^3

x^3 = 27 // ^ 1/3

x = 3

x = 3

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