It can work well here to simplify inside parentheses first.

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The correct selection is not show with your problem statement.
Between the 4 and the 7 is it a multiplication or an X?
If the multiplication sign, this is the solution

48+56=104; 170-104= 66. The librarian needs to pack 66 more books.
Answer:
it (6,18,23)
Step-by-step explanation: