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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
108/b = 9 // - 9
108/b-9 = 0
108*b^-1 = 9 // : 108
b^-1 = 1/12
-1 < 0
1/(b^1) = 1/12 // * b^1
1 = 1/12*b^1 // : 1/12
12 = b^1
b = 12
b = 12
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