Ответ:

[tex] \frac{2}{7} x + \frac{3}{7} x + \frac{104}{10} = x \\ \frac{5}{7} x - \frac{7}{ 7 } x = - \frac{104}{10} \\ - \frac{2}{7} x = - \frac{104}{10} \\ - x = - \frac{104}{10} \div - \frac{2}{7} = - \frac{104}{10} \times - \frac{7}{2} = -364/10 \\ x = 364/10 \\ 364/10 \times \frac{2}{7} = 52/5=10.4 \\ 361/10\times \frac{3}{7} = \frac{156}{10} =15.6[/tex]

10.4см Перша 15.6 см друга