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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
0.1/d-70 = 0
0.1*d^-1 = 70 // : 0.1
d^-1 = 700
-1 < 0
1/(d^1) = 700 // * d^1
1 = 700*d^1 // : 700
1/700 = d^1
d = 1/700
d = 1/700
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