Решим уравнение:
$$ y - \frac{7}{12}y = 4\frac{1}{6} $$
$$ \frac{12}{12}y - \frac{7}{12}y = \frac{4 \cdot 6 + 1}{6} $$
$$ \frac{5}{12}y = \frac{25}{6} $$
$$ y = \frac{25}{6} : \frac{5}{12} $$
$$ y = \frac{25}{6} \cdot \frac{12}{5} $$
$$ y = \frac{25 \cdot 12}{6 \cdot 5} $$
$$ y = \frac{300}{30} $$
$$ y = 10 $$
Ответ: y = 10