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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
4128/d = 86 // - 86
4128/d-86 = 0
4128*d^-1 = 86 // : 4128
d^-1 = 1/48
-1 < 0
1/(d^1) = 1/48 // * d^1
1 = 1/48*d^1 // : 1/48
48 = d^1
d = 48
d = 48
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