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3*x^8-(12/4)-7 = 0
3*x^8-7-3 = 0
3*x^8 = 10 // : 3
x^8 = 10/3
x^8 = 10/3 // ^ 1/8
abs(x) = (10/3)^(1/8)
x = (10/3)^(1/8) or x = -(10/3)^(1/8)
x in { (10/3)^(1/8), -(10/3)^(1/8) }
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