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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
-16/d = 4 // - 4
-16/d-4 = 0
-16*d^-1 = 4 // : -16
d^-1 = -1/4
-1 < 0
1/(d^1) = -1/4 // * d^1
1 = -1/4*d^1 // : -1/4
-4 = d^1
d = -4
d = -4
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