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x in (-oo:+oo)
(x^1)/3 = 27 // - 27
(x^1)/3-27 = 0
x/3-27 = 0
1/3*x-27 = 0 // + 27
1/3*x = 27 // : 1/3
x = 27/1/3
x = 81
x = 81
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