Оля08042002

- 9 * (8 - 9х) = 4х + 5

- 72 + 81х = 4х + 5

81х - 4х = 5 + 72

77х = 77

х = 77 : 77

х = 1

Проверка: - 9 * (8 - 9 * 1) = 4 * 1 + 5

                  - 9 * (- 1) = 4 + 5

                   9 = 9

Ответ: х = 1.

prettypushkova

Verified answer

-72+81x=4x+577x=77X=1