r^3=1/27 - solution

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Solution for r^3=1/27 equation:

r in (-oo:+oo)

r^3 = 1/27 // - 1/27

r^3-(1/27) = 0

r^3-1/27 = 0

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

r^3 = 1/27

r^3 = 1/27 // ^ 1/3

r = 1/3

r = 1/3

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