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12/3-(3*x^4)+3 = 0
12/3-3*x^4+3 = 0
-3*x^4 = -7 // : -3
x^4 = 7/3
x^4 = 7/3 // ^ 1/4
abs(x) = (7/3)^(1/4)
x = (7/3)^(1/4) or x = -(7/3)^(1/4)
x in { (7/3)^(1/4), -(7/3)^(1/4) }
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