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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
5/d = 370 // - 370
5/d-370 = 0
5*d^-1 = 370 // : 5
d^-1 = 74
-1 < 0
1/(d^1) = 74 // * d^1
1 = 74*d^1 // : 74
1/74 = d^1
d = 1/74
d = 1/74
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