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1) = 5a - 8b - 7c - 2a +3b + c = 3a - 5b - 6c 2) = 3n + 6m - 15k - n - 5m + 8k = m + 2n - 7k 3) = 8,2a - 4b +10,3c - 4a - 9,5b - 8c = 4,2a - 13,5b + 2,3c