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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
-35/d = 5 // - 5
-35/d-5 = 0
-35*d^-1 = 5 // : -35
d^-1 = -1/7
-1 < 0
1/(d^1) = -1/7 // * d^1
1 = -1/7*d^1 // : -1/7
-7 = d^1
d = -7
d = -7
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