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x in (-oo:+oo)
X-((1/5)*x^5) = 0
X+(-1/5)*x^5 = 0
-1/5*x^5 = -X // : -1/5
x^5 = 5*X
x^5 = 5*X // ^ 1/5
x = 5^(1/5)*X^(1/5)
x = 5^(1/5)*X^(1/5)
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