Question

помогите решить пример брату​

Answer 1

Ответ:

$\frac{5}{x + 7} - \frac{3}{x - 7} = 0$

$\frac{5(x - 7) - 3(x + 7)}{(x + 7) \times (x - 7)} = 0$

$\frac{5x - 35 - 3x - 21}{(x + 7) \times (x - 7)} = 0$

$\frac{2x - 56}{(x + 7) \times (x - 7)} = 0$

$2x - 56 = 0$

$2x = 56$

$x = 28$