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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
85/100 = 612/d // - 612/d
85/100-(612/d) = 0
85/100-612*d^-1 = 0
-612*d^-1 = -17/20 // : -612
d^-1 = 1/720
-1 < 0
1/(d^1) = 1/720 // * d^1
1 = 1/720*d^1 // : 1/720
720 = d^1
d = 720
d = 720
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