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x in (-oo:+oo)
x^3 = 1/216 // - 1/216
x^3-(1/216) = 0
x^3-1/216 = 0
1*x^3 = 1/216 // : 1
x^3 = 1/216
x^3 = 1/216 // ^ 1/3
x = 1/6
x = 1/6
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