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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(x^4)-64 = 0
2*x^-3 = 64 // : 2
x^-3 = 32
-3 < 0
1/(x^3) = 32 // * x^3
1 = 32*x^3 // : 32
1/32 = x^3
x^3 = 1/32 // ^ 1/3
x = (1/32)^(1/3)
x = (1/32)^(1/3)
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