3. Решить уравнения: А) $$x - \frac{7}{9} = \frac{7}{12}$$ Б) $$\frac{11}{12} - y = \frac{7}{24}$$

А) $$x - \frac{7}{9} = \frac{7}{12}$$ $$x = \frac{7}{12} + \frac{7}{9} = \frac{7 \cdot 3 + 7 \cdot 4}{36} = \frac{21+28}{36} = \frac{49}{36} = 1\frac{13}{36}$$ Б) $$\frac{11}{12} - y = \frac{7}{24}$$ $$y = \frac{11}{12} - \frac{7}{24} = \frac{22 - 7}{24} = \frac{15}{24} = \frac{5}{8}$$