a) \(\frac{19}{30}\) -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 = \(\frac{4}{15}\)
Ответ: \(\frac{4}{15}\)