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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 3-4/x // - 3-4/x
y-(-4/x)-3 = 0
4*x^-1+y-3 = 0
4*x^-1 = -(y-3) // : 4
x^-1 = (3-y)/4
-1 < 0
1/(x^1) = (3-y)/4 // * x^1
1 = x^1*((3-y)/4) // : (3-y)/4
4*(3-y)^-1 = x^1
x = 4*(3-y)^-1
x = 4*(3-y)^-1
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