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x in (-oo:+oo)
x^3 = 216/729 // - 216/729
x^3-(216/729) = 0
x^3-8/27 = 0
1*x^3 = 8/27 // : 1
x^3 = 8/27
x^3 = 8/27 // ^ 1/3
x = 2/3
x = 2/3
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