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D( x )
2*x^(2^3) = 0
2*x^(2^3) = 0
2*x^(2^3) = 0
2*x^8 = 0 // : 2
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
12/(2*x^(2^3)) = 120 // - 120
12/(2*x^(2^3))-120 = 0
6*x^-8 = 120 // : 6
x^-8 = 20
-8 < 0
1/(x^8) = 20 // * x^8
1 = 20*x^8 // : 20
1/20 = x^8
x^8 = 1/20 // ^ 1/8
abs(x) = (1/20)^(1/8)
x = (1/20)^(1/8) or x = -(1/20)^(1/8)
x in { (1/20)^(1/8), -(1/20)^(1/8) }
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