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D( x )
3*x = 0
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 1/3-(2/(3*x)) // - 1/3-(2/(3*x))
1/x+2/(3*x)-(1/3) = 0
1/x+2/(3*x)-1/3 = 0
5/3*x^-1 = 1/3 // : 5/3
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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