4x^(2/3)+5=21

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Solution for 4x^(2/3)+5=21 equation: 


x in (-oo:+oo)

4*x^(2/3)+5 = 21 // - 21

4*x^(2/3)-21+5 = 0

4*x^(2/3) = 16 // : 4

x^(2/3) = 4

x^(2/3) = 4 // ^ 3

x^2 = 64 // ^ 1/2

abs(x) = 8

x = 8 or x = -8

x in { 8, -8 }

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