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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)
2/x = 1/(3*x)+2/4 // - 1/(3*x)+2/4
2/x-(1/(3*x))-(2/4) = 0
2/x+(-1/3)*x^-1-1/2 = 0
5/3*x^-1 = 1/2 // : 5/3
x^-1 = 3/10
-1 < 0
1/(x^1) = 3/10 // * x^1
1 = 3/10*x^1 // : 3/10
10/3 = x^1
x = 10/3
x = 10/3
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