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