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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
15/b = 15 // - 15
15/b-15 = 0
15*b^-1 = 15 // : 15
b^-1 = 1
-1 < 0
1/(b^1) = 1 // * b^1
1 = 1*b^1 // : 1
1 = b^1
b = 1
b = 1
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