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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2/d-8 = -10 // + 10
2/d-8+10 = 0
2*d^-1 = -2 // : 2
d^-1 = -1
-1 < 0
1/(d^1) = -1 // * d^1
1 = -1*d^1 // : -1
-1 = d^1
d = -1
d = -1
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