Пошаговое объяснение:

[tex]1)\frac{x - 5}{x + 3} = \frac{9}{7} \\ \frac{x - 5}{x + 3} = \frac{9}{7}x≠ - 3 \\ 7(x - 5) = 9(x + 3) \\ 7x - 35 = 9x + 27 \\ 7x - 9x = 27 + 35 \\ - 2x = 62 \\ x = - 31,x≠ - 3 \\ x = - 31 \\ 2)\frac{2}{21} x + 3,7 = 2,5 - \frac{1}{14} x \\ \frac{2}{21} x + \frac{37}{10} = \frac{5}{2} - \frac{1}{14} x \\ 20x + 777 = 525 - 15x \\ 20x + 15x = 525 - 777 \\ 35x = - 252 \\ x = - \frac{36}{5} [/tex]