6) * Решите уравнение: a. $$4\frac{8}{19} + \frac{7}{19} - x = \frac{3}{19}$$; б. $$2\frac{1}{14} - 1\frac{2}{3}x = 1\frac{5}{21}$$.

a. $$4\frac{8}{19} + \frac{7}{19} - x = \frac{3}{19}$$ $$4\frac{15}{19} - x = \frac{3}{19}$$ $$x = 4\frac{15}{19} - \frac{3}{19}$$ $$x = 4\frac{12}{19}$$ б. $$2\frac{1}{14} - 1\frac{2}{3}x = 1\frac{5}{21}$$ $$\frac{29}{14} - \frac{5}{3}x = \frac{26}{21}$$ $$\frac{5}{3}x = \frac{29}{14} - \frac{26}{21}$$ $$\frac{5}{3}x = \frac{87}{42} - \frac{52}{42}$$ $$\frac{5}{3}x = \frac{35}{42}$$ $$\frac{5}{3}x = \frac{5}{6}$$ $$x = \frac{5}{6} : \frac{5}{3}$$ $$x = \frac{5}{6} * \frac{3}{5}$$ $$x = \frac{15}{30}$$ $$x = \frac{1}{2}$$