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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
660/360 = 11/b // - 11/b
660/360-(11/b) = 0
660/360-11*b^-1 = 0
-11*b^-1 = -11/6 // : -11
b^-1 = 1/6
-1 < 0
1/(b^1) = 1/6 // * b^1
1 = 1/6*b^1 // : 1/6
6 = b^1
b = 6
b = 6
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