a) Дано уравнение: \(\frac{19}{30}\) - x = \(\frac{14}{30}\) - \(\frac{3}{30}\).
\(\frac{14}{30}\) - \(\frac{3}{30}\) = \(\frac{14-3}{30}\) = \(\frac{11}{30}\)
\(\frac{19}{30}\) - x = \(\frac{11}{30}\)
\(\frac{19}{30}\) - \(\frac{11}{30}\) = x
x = \(\frac{19-11}{30}\) = \(\frac{8}{30}\)
x = \(\frac{8}{30}\) = \(\frac{4}{15}\)
Ответ: x = \(\frac{4}{15}\)