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