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How to work out this word problem?

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1 Answer

You need to change the English sentence into a math sentence (equation).
 
Dimitrius returned 5 library books last week,   returned 5 => -5
returned 3 books this week   Returned 3 => -3
and then checked out 8 more books.  checked out 8 => +8
He now has 12 library books.  Now has 12  => 12
How many books did he have before last week?  the unknown call it B for books
 
B -5 -3 +8 = 12
 
can you solve that?