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X in (-oo:+oo)
(X^5)/3 = -243 // + 243
(X^5)/3+243 = 0
1/3*X^5 = -243 // : 1/3
X^5 = -729
X^5 = -729 // ^ 1/5
X = -3*3^(1/5)
X = -3*3^(1/5)
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