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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2/d+1/4 = 11/12 // - 11/12
2/d+1/4-(11/12) = 0
2/d+1/4-11/12 = 0
2*d^-1 = 2/3 // : 2
d^-1 = 1/3
-1 < 0
1/(d^1) = 1/3 // * d^1
1 = 1/3*d^1 // : 1/3
3 = d^1
d = 3
d = 3
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