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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
65/d+2 = 6 // - 6
65/d-6+2 = 0
65*d^-1 = 4 // : 65
d^-1 = 4/65
-1 < 0
1/(d^1) = 4/65 // * d^1
1 = 4/65*d^1 // : 4/65
65/4 = d^1
d = 65/4
d = 65/4
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