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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
3/d = 1/5.2 // - 1/5.2
3/d-(1/5.2) = 0
3/d-0.19230769 = 0
3*d^-1 = 0.19230769 // : 3
d^-1 = 0.06410256
-1 < 0
1/(d^1) = 0.06410256 // * d^1
1 = 0.06410256*d^1 // : 0.06410256
15.600001 = d^1
d = 15.600001
d = 15.600001
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