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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
1 = 12/d-1 // - 12/d-1
1-(12/d)+1 = 0
1-12*d^-1+1 = 0
-12*d^-1 = -2 // : -12
d^-1 = 1/6
-1 < 0
1/(d^1) = 1/6 // * d^1
1 = 1/6*d^1 // : 1/6
6 = d^1
d = 6
d = 6
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