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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
18.2/b = 9.1/4 // - 9.1/4
18.2/b-(9.1/4) = 0
18.2/b-2.275 = 0
18.2*b^-1 = 2.275 // : 18.2
b^-1 = 0.125
-1 < 0
1/(b^1) = 0.125 // * b^1
1 = 0.125*b^1 // : 0.125
8 = b^1
b = 8
b = 8
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