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