Ответ:
1) 79 - 20 - 9а + 11а - 122 = 2а - 63
2) -b - 40 + 28 - 19b + 11b = - 9b - 12
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Ответ:
1) 79 - 20 - 9а + 11а - 122 = 2а - 63
2) -b - 40 + 28 - 19b + 11b = - 9b - 12