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X in (-oo:+oo)
((X^1)/4)^4 = (-3/2)^4 // - (-3/2)^4
((X^1)/4)^4-(-3/2)^4 = 0
(X/4)^4-(-3/2)^4 = 0
1/256*X^4 = 81/16 // : 1/256
X^4 = 1296
X^4 = 1296 // ^ 1/4
abs(X) = 6
X = 6 or X = -6
X in { 6, -6 }
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