Question

x-4 x+3
---- = -----
4        7

Answer 1

$7(x - 4) = 4(x + 3)$
$7x - 28 = 4x + 12$
$7x - 4x = 12 + 28$
$3x = 40$
$x = frac{40}{3}$

Answer 2

х - 4 / 4 = х + 3 / 7 | 28
7х - 28 = 4х + 12
7х - 4х = 12 + 28
3х = 40
х = 40/3 = 13 1/3.
Ответ: х = 13 1/3.
Удачи)))