\[b(2 - x) = 6\]
\[2 - x = \frac{6}{b}\]
\[x = 2 - \frac{6}{b}\]
\[x = \frac{2b - 6}{b}\]
\[\frac{2b - 6}{b} < 0\]
\[\frac{2 \cdot (b - 3)}{b} < 0\]
\[0 < b < 3.\]
\[Ответ:при\ b = 1;2.\]