\[4\frac{5}{12} + y = - 5\frac{3}{20}\]
\[y = - 5\frac{3^{\backslash 3}}{20} - 4\frac{5^{\backslash 5}}{12}\]
\[y = - 5\frac{9}{60} - 4\frac{25}{60}\]
\[y = - 9\frac{34}{60}\]
\[y = - 9\frac{17}{30}\]
\[Ответ:\ y = - 9\frac{17}{30}.\]