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12/(1-3)-(-7*x^4)-12 = 0
7*x^4+12/(1-3)-12 = 0
7*x^4 = 18 // : 7
x^4 = 18/7
x^4 = 18/7 // ^ 1/4
abs(x) = (18/7)^(1/4)
x = (18/7)^(1/4) or x = -(18/7)^(1/4)
x in { (18/7)^(1/4), -(18/7)^(1/4) }
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