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Решите задачу:

$y - \frac{7}{12} = 3 \frac{1}{2} \times ( - \frac{4}{7} ) \\ y - \frac{7}{12} = - 3 \times \frac{2}{7} \\ y - \frac{7}{12} = - \frac{6}{7} \\ y = - \frac{6}{7} + \frac{7}{12} \\ y = - \frac{23}{84} \\ \\ \\ ( - \frac{5}{14} ) \times \frac{21}{25} - y = 3 \frac{3}{4} \\ - \frac{1}{2} \times \frac{3}{5} - y = \frac{9}{4} \\ - \frac{3}{10} = y - \frac{9}{4} \\ - y = \frac{9}{4} + \frac{3}{10} \\ - y = \frac{51}{20} \\ y = - \frac{51}{20}$