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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8/b-17 = 13 // - 13
8/b-17-13 = 0
8*b^-1 = 30 // : 8
b^-1 = 15/4
-1 < 0
1/(b^1) = 15/4 // * b^1
1 = 15/4*b^1 // : 15/4
4/15 = b^1
b = 4/15
b = 4/15
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