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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)
1/(3*x) = 2/3 // - 2/3
1/(3*x)-(2/3) = 0
1/(3*x)-2/3 = 0
1/3*x^-1 = 2/3 // : 1/3
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x = 1/2
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