Решение и ответ:
(a - b + 6.1) - (a - b + 6.1) = a - b + 6.1 - a + b - 6.1 = 0
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Решение и ответ:
(a - b + 6.1) - (a - b + 6.1) = a - b + 6.1 - a + b - 6.1 = 0