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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x^(-2/3) = 16 // - 16
4*x^(-2/3)-16 = 0
4*x^(-2/3) = 16 // : 4
x^(-2/3) = 4
-2/3 < 0
1/(x^(2/3)) = 4 // * x^(2/3)
1 = 4*x^(2/3) // : 4
1/4 = x^(2/3)
x^(2/3) = 1/4 // ^ 3
x^2 = 1/64 // ^ 1/2
abs(x) = 1/8
x = 1/8 or x = -1/8
x in { 1/8, -1/8 }
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