\[2 < \frac{4x + 3}{3} \leq 3\]
\[6 < 4x + 3 \leq 9\]
\[3 < 4x \leq 6\]
\[\frac{3}{4} < x \leq 1,5\]
\[Ответ:\left( \frac{3}{4};1,5 \right\rbrack.\]