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X-((x^4)/3)-4 = 0
-1/3*x^4 = -(X-4) // : -1/3
x^4 = -3*(4-X)
x^4 = -3*(4-X) // ^ 1/4
abs(x) = (-3)^(1/4)*(4-X)^(1/4)
x = (-3)^(1/4)*(4-X)^(1/4) or x = -((-3)^(1/4)*(4-X)^(1/4))
x in { (-3)^(1/4)*(4-X)^(1/4), -((-3)^(1/4)*(4-X)^(1/4)) }
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