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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
300/d = 20 // - 20
300/d-20 = 0
300*d^-1 = 20 // : 300
d^-1 = 1/15
-1 < 0
1/(d^1) = 1/15 // * d^1
1 = 1/15*d^1 // : 1/15
15 = d^1
d = 15
d = 15
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