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D( x )
x^8 = 0
x^8 = 0
x^8 = 0
1*x^8 = 0 // : 1
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(x^8) = 12 // - 12
(2*x)/(x^8)-12 = 0
2*x^-7 = 12 // : 2
x^-7 = 6
-7 < 0
1/(x^7) = 6 // * x^7
1 = 6*x^7 // : 6
1/6 = x^7
x^7 = 1/6 // ^ 1/7
x = (1/6)^(1/7)
x = (1/6)^(1/7)
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