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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
8/3 = 2/(3*x) // - 2/(3*x)
8/3-(2/(3*x)) = 0
(-2/3)*x^-1+8/3 = 0
-2/3*x^-1 = -8/3 // : -2/3
x^-1 = 4
-1 < 0
1/(x^1) = 4 // * x^1
1 = 4*x^1 // : 4
1/4 = x^1
x = 1/4
x = 1/4
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