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