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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
9/d = 27/36 // - 27/36
9/d-(27/36) = 0
9/d-3/4 = 0
9*d^-1 = 3/4 // : 9
d^-1 = 1/12
-1 < 0
1/(d^1) = 1/12 // * d^1
1 = 1/12*d^1 // : 1/12
12 = d^1
d = 12
d = 12
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