Ответы на вопрос:
(99 - 9х) * 8 + 14 = 86 (99 - 9х) * 8 = 86 - 14 (99 - 9х) * 8 = 72 99 - 9х = 72 : 8 99 - 9х = 9 9х = 99 - 9 9х = 90 х = 90 : 9 х = 10 проверка: (99 - 9 * 10) * 8 + 14= 86 (99 - 90) * 8 + 14 = 86 9 * 8 + 14 = 86 72 + 14 = 86 86 = 86
(99-9х) · 8 + 14 = 86
792 - 72х +14 =86
806 -72х = 86
-72х = 86 - 806
-72х = -720
х = -720 : (-72)
х = 10
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