Раскройте скобки и приведите подобные слагаемые:
3,3а + ( а - 4) 5,3b - (2b + 3) 2c - (9 - 5,1c)
5а - (0,7а + 8) 9,6b + (7 - 0,4b) -5c + (13 - 6c)
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