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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)
X-(4/(3*x)) = -1/3 // + -1/3
X-(4/(3*x))-(-1/3) = 0
X+(-4/3)*x^-1+1/3 = 0
-4/3*x^-1 = -(X+1/3) // : -4/3
x^-1 = 3/4*(X+1/3)
-1 < 0
1/(x^1) = 3/4*(X+1/3) // * x^1
1 = 3/4*x^1*(X+1/3) // : 3/4*(X+1/3)
4/3*(X+1/3)^-1 = x^1
x = 4/3*(X+1/3)^-1
x = 4/3*(X+1/3)^-1
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