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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
-12/d = 4 // - 4
-12/d-4 = 0
-12*d^-1 = 4 // : -12
d^-1 = -1/3
-1 < 0
1/(d^1) = -1/3 // * d^1
1 = -1/3*d^1 // : -1/3
-3 = d^1
d = -3
d = -3
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