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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x+6 = -1 // + 1
12/x+1+6 = 0
12*x^-1 = -7 // : 12
x^-1 = -7/12
-1 < 0
1/(x^1) = -7/12 // * x^1
1 = -7/12*x^1 // : -7/12
-12/7 = x^1
x = -12/7
x = -12/7
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