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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
70/d = 7 // - 7
70/d-7 = 0
70*d^-1 = 7 // : 70
d^-1 = 1/10
-1 < 0
1/(d^1) = 1/10 // * d^1
1 = 1/10*d^1 // : 1/10
10 = d^1
d = 10
d = 10
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