51) 1/3 y – 1/6 = 2 – 1/6 y

Решим уравнение:

$$ \frac{1}{3} y – \frac{1}{6} = 2 – \frac{1}{6} y $$

$$ \frac{1}{3} y + \frac{1}{6} y = 2 + \frac{1}{6} $$

$$ \frac{2}{6} y + \frac{1}{6} y = \frac{12}{6} + \frac{1}{6} $$

$$ \frac{3}{6} y = \frac{13}{6} $$

$$ \frac{1}{2} y = \frac{13}{6} $$

$$ y = \frac{13}{6} : \frac{1}{2} $$

$$ y = \frac{13}{6} \cdot \frac{2}{1} $$

$$ y = \frac{13}{3} $$

Ответ: $$ y = \frac{13}{3} $$