\[\boxed{\text{6.228.}}\]
\[\textbf{а)}\ (x - 7,38) \cdot 4 = 18\]
\[x - 7,38 = 18\ :4\]
\[x - 7,38 = 4,5\]
\[x = 4,5 + 7,38\]
\[x = 11,88.\ \]
\[Ответ:11,88.\ \]
\[\textbf{б)}\ (y + 0,7)\ :3 = 2,69\ \]
\[y + 0,7 = 2,69 \cdot 3\]
\[y + 0,7 = 8,07\]
\[y = 8,07 - 0,7\]
\[y = 7,37.\ \]
\[Ответ:7,37.\ \]