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