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X in (-oo:+oo)
(X^4)/3 = 10 // - 10
(X^4)/3-10 = 0
1/3*X^4 = 10 // : 1/3
X^4 = 30
X^4 = 30 // ^ 1/4
abs(X) = 30^(1/4)
X = 30^(1/4) or X = -30^(1/4)
X in { 30^(1/4), -30^(1/4) }
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