Реши уравнение и сделай проверку: a) x+3 4/7=6 2/21

Решим уравнения: a) $x + 3\frac{4}{7} = 6\frac{2}{21}$ $x = 6\frac{2}{21} - 3\frac{4}{7}$ $x = 6\frac{2}{21} - 3\frac{12}{21}$ $x = 5\frac{23}{21} - 3\frac{12}{21}$ $x = 2\frac{11}{21}$ Проверка: $2\frac{11}{21} + 3\frac{4}{7} = 6\frac{2}{21}$ $2\frac{11}{21} + 3\frac{12}{21} = 6\frac{2}{21}$ $5\frac{23}{21} = 6\frac{2}{21}$ $6\frac{2}{21} = 6\frac{2}{21}$ б) $5\frac{7}{12} + x = 8\frac{5}{16}$ $x = 8\frac{5}{16} - 5\frac{7}{12}$ $x = 8\frac{15}{48} - 5\frac{28}{48}$ $x = 7\frac{63}{48} - 5\frac{28}{48}$ $x = 2\frac{35}{48}$ Проверка: $5\frac{7}{12} + 2\frac{35}{48} = 8\frac{5}{16}$ $5\frac{28}{48} + 2\frac{35}{48} = 8\frac{5}{16}$ $7\frac{63}{48} = 8\frac{5}{16}$ $8\frac{15}{48} = 8\frac{5}{16}$ $8\frac{5}{16} = 8\frac{5}{16}$ **Ответ:** а) $x = 2\frac{11}{21}$, б) $x = 2\frac{35}{48}$