3x^(2/3)-6=21

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Solution for 3x^(2/3)-6=21 equation: 


x in (-oo:+oo)

3*x^(2/3)-6 = 21 // - 21

3*x^(2/3)-21-6 = 0

3*x^(2/3) = 27 // : 3

x^(2/3) = 9

x^(2/3) = 9 // ^ 3

x^2 = 729 // ^ 1/2

abs(x) = 27

x = 27 or x = -27

x in { 27, -27 }

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