Ответ:
7b - (5b - (2 - 3b)) = 7b - (5b - 2 + 3b) = 7b - 5b + 2 - 3b = 2b + 2 - 3b = -b + 2 = 2 - b
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Ответ:
7b - (5b - (2 - 3b)) = 7b - (5b - 2 + 3b) = 7b - 5b + 2 - 3b = 2b + 2 - 3b = -b + 2 = 2 - b