Question

Плиз,(87-х•9)•40=960.срочно!

Answer 1

(87 - 9х) * 40 = 960
87 - 9х = 960 : 40
87 - 9х = 24
9х = 87 - 24
9х = 63
х = 63 : 9
х = 7
Проверка: (87 - 9 * 7) * 40 = 960
                  (87 - 63) * 40 = 960
                   24 * 40 = 960
                   960 = 960