\[2b - 1 > \frac{4 + 3b}{5}\]
\[10b - 5 > 4 + 3b\]
\[7b > 9\]
\[b > 1\frac{2}{7}\]
\[Ответ:при\ \ b \in \left( 1\frac{2}{7};\ + \infty \right).\]