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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
12/b = 6/4 // - 6/4
12/b-(6/4) = 0
12/b-3/2 = 0
12*b^-1 = 3/2 // : 12
b^-1 = 1/8
-1 < 0
1/(b^1) = 1/8 // * b^1
1 = 1/8*b^1 // : 1/8
8 = b^1
b = 8
b = 8
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