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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-2/3) = 1/36 // - 1/36
x^(-2/3)-(1/36) = 0
x^(-2/3)-1/36 = 0
1*x^(-2/3) = 1/36 // : 1
x^(-2/3) = 1/36
-2/3 < 0
1/(x^(2/3)) = 1/36 // * x^(2/3)
1 = 1/36*x^(2/3) // : 1/36
36 = x^(2/3)
x^(2/3) = 36 // ^ 3
x^2 = 46656 // ^ 1/2
abs(x) = 216
x = 216 or x = -216
x in { 216, -216 }
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