\[\boxed{\text{5.\ 34.}}\]
\[\textbf{а)}\ (x - 111) \cdot 59 = 11\ 918\]
\[x - 111 = 11\ 918\ :59\]
\[x - 111 = 202\]
\[x = 202 + 111\]
\[x = 313.\ \]
\[Ответ:313.\ \]
\[\textbf{б)}\ 975 \cdot (y - 615) = 12\ 675\]
\[y - 615 = 12\ 675\ :975\]
\[y - 615 = 13\]
\[y = 13 + 615\]
\[y = 628.\ \]
\[Ответ:628.\ \]
\[\textbf{в)}\ (30\ 901 - a)\ :605 = 51\]
\[30\ 901 - a = 51 \cdot 605\]
\[30\ 901 - a = 30\ 855\]
\[a = 30\ 901 - 30\ 855\]
\[a = 46.\ \]
\[Ответ:46.\ \]
\[\textbf{г)}\ 39\ 765\ :(b - 893) = 1\ 205\]
\[b - 893 = 39\ 765\ :1\ 205\]
\[b - 893 = 33\]
\[b = 33 + 893\]
\[b = 926.\ \]
\[Ответ:926.\]