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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+4/x = -1 // + 1
X+4/x+1 = 0
4*x^-1 = -(X+1) // : 4
x^-1 = (-(X+1))/4
-1 < 0
1/(x^1) = (-(X+1))/4 // * x^1
1 = x^1*((-(X+1))/4) // : (-(X+1))/4
-4*(X+1)^-1 = x^1
x = -4*(X+1)^-1
x = -4*(X+1)^-1
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