Вынесите общий множитель за скобки:
а) 5а+ 5b
б) 6-9с
в) 7 ef + 14 ef + 28 ef
г) 9 + 18 mn + 21 nk
д)  х  в 3 + 1,7 х во 2 - 2,7 х
е) 2/5 kl + 1/5 l - 1/5 k
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