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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
15/b = 5 // - 5
15/b-5 = 0
15*b^-1 = 5 // : 15
b^-1 = 1/3
-1 < 0
1/(b^1) = 1/3 // * b^1
1 = 1/3*b^1 // : 1/3
3 = b^1
b = 3
b = 3
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