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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
9.1/b = 10/100 // - 10/100
9.1/b-(10/100) = 0
9.1/b-1/10 = 0
9.1*b^-1 = 1/10 // : 9.1
b^-1 = 0.01098901
-1 < 0
1/(b^1) = 0.01098901 // * b^1
1 = 0.01098901*b^1 // : 0.01098901
91.00000819 = b^1
b = 91.00000819
b = 91.00000819
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