Math 6

Question Analysis
This question tests the application of real numbers in a context involving subtraction.

Key Concept Explanation
The problem involves subtracting a positive number from another positive number to find the remaining quantity.

Step-by-step Solution
1. Identify the initial quantity: The initial number of books is .
2. Identify the loss: The number of books lost is .
3. Apply the operation: Subtract the loss from the initial quantity:

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