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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
11/b+5 = 12 // - 12
11/b-12+5 = 0
11*b^-1 = 7 // : 11
b^-1 = 7/11
-1 < 0
1/(b^1) = 7/11 // * b^1
1 = 7/11*b^1 // : 7/11
11/7 = b^1
b = 11/7
b = 11/7
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