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(3/2)*x^4 = 16 // - 16
(3/2)*x^4-16 = 0
3/2*x^4 = 16 // : 3/2
x^4 = 32/3
x^4 = 32/3 // ^ 1/4
abs(x) = (32/3)^(1/4)
x = (32/3)^(1/4) or x = -(32/3)^(1/4)
x in { (32/3)^(1/4), -(32/3)^(1/4) }
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