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If there are x books in this batch, the number of books in grade five is 3/7 x, and that in grade six is 4/7x.

3/7 x-26=2/5x-4

3/7 x-2/5x=22

( 15- 14)/35 x=22

The solution is x=770.

A: There are 770 books in this batch.

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