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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
48.23/d-2.68 = 6.42 // - 6.42
48.23/d-6.42-2.68 = 0
48.23*d^-1 = 9.1 // : 48.23
d^-1 = 0.18867925
-1 < 0
1/(d^1) = 0.18867925 // * d^1
1 = 0.18867925*d^1 // : 0.18867925
5.29999987 = d^1
d = 5.29999987
d = 5.29999987
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