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X in (-oo:+oo)
5/6 = X^210 // - X^210
5/6-X^210 = 0
-1*X^210 = -5/6 // : -1
X^210 = 5/6
X^210 = 5/6 // ^ 1/210
abs(X) = (5/6)^(1/210)
X = (5/6)^(1/210) or X = -(5/6)^(1/210)
X in { (5/6)^(1/210), -(5/6)^(1/210) }
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