1) 5а - 8а - 4а = - 3а - 4а = - 7а
2) 8b - 7c - 6 - b +5c = 8b - b - 7c + 5c - 6 = 7b - 2c - 6
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1) 5а - 8а - 4а = - 3а - 4а = - 7а
2) 8b - 7c - 6 - b +5c = 8b - b - 7c + 5c - 6 = 7b - 2c - 6