Решение и ответ:
a - (a - 9) + (7a - 11) = a - a + 9 + 7a - 11 = 7a + 9 - 11 = 7a - 2
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Решение и ответ:
a - (a - 9) + (7a - 11) = a - a + 9 + 7a - 11 = 7a + 9 - 11 = 7a - 2