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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
5/b = 18/b-16 // - 18/b-16
5/b-(18/b)+16 = 0
5/b-18*b^-1+16 = 0
-13*b^-1 = -16 // : -13
b^-1 = 16/13
-1 < 0
1/(b^1) = 16/13 // * b^1
1 = 16/13*b^1 // : 16/13
13/16 = b^1
b = 13/16
b = 13/16
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