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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
4/d = 7/3 // - 7/3
4/d-(7/3) = 0
4/d-7/3 = 0
4*d^-1 = 7/3 // : 4
d^-1 = 7/12
-1 < 0
1/(d^1) = 7/12 // * d^1
1 = 7/12*d^1 // : 7/12
12/7 = d^1
d = 12/7
d = 12/7
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