Решение:
а) \(\frac{19}{30} - x = \frac{14}{30} - \frac{3}{30}\)
$$\frac{19}{30} - x = \frac{11}{30}$$ $$x = \frac{19}{30} - \frac{11}{30}$$ $$x = \frac{8}{30}$$ $$x = \frac{4}{15}$$б) \(\frac{18}{25} - \frac{7}{25} + y = \frac{14}{25}\)
$$\frac{11}{25} + y = \frac{14}{25}$$ $$y = \frac{14}{25} - \frac{11}{25}$$ $$y = \frac{3}{25}$$Ответ: а) \(\frac{4}{15}\); б) \(\frac{3}{25}\)