(x-11)/4 + (2x-7)/7 = 0
Умножаем всё уравнение на 4*7 = 28: 7(x - 11) + 4(2x - 7) = 0 7x - 77 + 8x - 28 = 0 15x - 105 = 0 15x = 105 x = 105/15 x = 7