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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
12-6/d = -7 // + 7
7-6/d+12 = 0
-6*d^-1 = -19 // : -6
d^-1 = 19/6
-1 < 0
1/(d^1) = 19/6 // * d^1
1 = 19/6*d^1 // : 19/6
6/19 = d^1
d = 6/19
d = 6/19
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