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X in (-oo:+oo)
(X^100)/200 = 80 // - 80
(X^100)/200-80 = 0
1/200*X^100 = 80 // : 1/200
X^100 = 16000
X^100 = 16000 // ^ 1/100
abs(X) = 16000^(1/100)
X = 16000^(1/100) or X = -16000^(1/100)
X in { 16000^(1/100), -16000^(1/100) }
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