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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
16/b = 2/3 // - 2/3
16/b-(2/3) = 0
16/b-2/3 = 0
16*b^-1 = 2/3 // : 16
b^-1 = 1/24
-1 < 0
1/(b^1) = 1/24 // * b^1
1 = 1/24*b^1 // : 1/24
24 = b^1
b = 24
b = 24
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