\[\boxed{\mathbf{6.117}}\]
\[1)\ \frac{2,3}{0,5x + 22} = \frac{2,8}{x + 1,7}\]
\[2,3 \cdot (x + 1,7) =\]
\[= 2,8 \cdot (0,5x + 2,2)\]
\[2,3x + 3,91 = 1,4x + 6,16\]
\[2,3x - 1,4x = 6,16 - 3,91\]
\[0,9x = 2,25\]
\[x = 2,25\ :0,9 = 22,5\ :9\]
\[x = 2,5.\]
\[2)\ \frac{5\frac{1}{3}}{2x + \frac{2}{3}} = \frac{4\frac{1}{2}}{3x - 3\frac{3}{8}}\]
\[\frac{16}{3} \cdot \left( 3x - \frac{27}{8} \right) = \left( 2x + \frac{2}{3} \right) \cdot \frac{9}{2}\]
\[16x - 18 = 9x + 3\]
\[16x - 9x = 3 + 18\]
\[7x = 21\]
\[x = 3.\]