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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x-(7/x)+1+12 = 0
12/x-7*x^-1+1+12 = 0
5*x^-1 = -13 // : 5
x^-1 = -13/5
-1 < 0
1/(x^1) = -13/5 // * x^1
1 = -13/5*x^1 // : -13/5
-5/13 = x^1
x = -5/13
x = -5/13
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