Плиз,(87-х•9)•40=960.срочно!
(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
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