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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
-2 = 10/d // - 10/d
-(10/d)-2 = 0
-10*d^-1-2 = 0
-10*d^-1 = 2 // : -10
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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