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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(12/x)-(x/x)+1+1 = 0
X-12*x^-1-1+1+1 = 0
-12*x^-1 = -(X+1) // : -12
x^-1 = (X+1)/12
-1 < 0
1/(x^1) = (X+1)/12 // * x^1
1 = x^1*((X+1)/12) // : (X+1)/12
12*(X+1)^-1 = x^1
x = 12*(X+1)^-1
x = 12*(X+1)^-1
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