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