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