2/3x^-3=7

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Solution for 2/3x^-3=7 equation: 


D( x )

x = 0

x = 0

x = 0

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

(2/3)*x^-3 = 7 // - 7

(2/3)*x^-3-7 = 0

2/3*x^-3 = 7 // : 2/3

x^-3 = 21/2

-3 < 0

1/(x^3) = 21/2 // * x^3

1 = 21/2*x^3 // : 21/2

2/21 = x^3

x^3 = 2/21 // ^ 1/3

x = (2/21)^(1/3)

x = (2/21)^(1/3)

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