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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-5-1 = 12/x-1 // - 12/x-1
1/x-(12/x)-5-1+1 = 0
1/x-12*x^-1-5-1+1 = 0
-11*x^-1 = 5 // : -11
x^-1 = -5/11
-1 < 0
1/(x^1) = -5/11 // * x^1
1 = -5/11*x^1 // : -5/11
-11/5 = x^1
x = -11/5
x = -11/5
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