To solve this problem, we need to determine the value of x, which represents the number of people who come and donate five books each in a week.
Let's break down the information given:
Number of book donations received: 300
Number of books donated by each person: 5
Number of books borrowed by other people: 140
Total number of books remaining in the store: 210
We can set up the equation as follows:
Number of book donations received + (Number of people * Number of books donated by each person) - Number of books borrowed by other people = Total number of books remaining in the store
300 + (x * 5) - 140 = 210
Let's simplify and solve for x:
300 + 5x - 140 = 210
To isolate x, we subtract 160 from both sides of the equation:
300 + 5x - 140 - 160 = 210 - 160
5x = 50
Finally, we divide both sides of the equation by 5 to solve for x:
x = 50 / 5
x = 10
The value of x is 10.
#### 10
The answer is: 10
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Tracy has a charity book collection store from which she receives book donations from members of her town. Any person who wants to borrow a book is free to do so as long as they return the book after they've finished reading. She has already received 300 book donations. If x people come and donate five books each in a week, and a total of 140 books are borrowed by other people to read, The total number of books she has remaining in the store is 210. What is the value of unknown variable x?

### Answer:
