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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
104/b = 13/10 // - 13/10
104/b-(13/10) = 0
104/b-13/10 = 0
104*b^-1 = 13/10 // : 104
b^-1 = 1/80
-1 < 0
1/(b^1) = 1/80 // * b^1
1 = 1/80*b^1 // : 1/80
80 = b^1
b = 80
b = 80
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