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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
5.18/b = 14 // - 14
5.18/b-14 = 0
5.18*b^-1 = 14 // : 5.18
b^-1 = 2.7027027
-1 < 0
1/(b^1) = 2.7027027 // * b^1
1 = 2.7027027*b^1 // : 2.7027027
0.37 = b^1
b = 0.37
b = 0.37
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