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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
48/20 = 12/d // - 12/d
48/20-(12/d) = 0
48/20-12*d^-1 = 0
-12*d^-1 = -12/5 // : -12
d^-1 = 1/5
-1 < 0
1/(d^1) = 1/5 // * d^1
1 = 1/5*d^1 // : 1/5
5 = d^1
d = 5
d = 5
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