https://file.aiquickdraw.com/mathbot/file/1726082585523dxpxym8m.jpg

The mathematical expression extracted from the image is:

\[
5x - 7x + 10 + 23
\]

Now, let's simplify this expression. 

### Simplification:
1. Combine like terms:
   \[
   5x - 7x = -2x
   \]
2. Add constants:
   \[
   10 + 23 = 33
   \]

So, the simplified expression is:
\[
-2x + 33
\]

The variable in this expression is \( x \).

Would you like further details or explanations? Here are some related questions to deepen understanding:

1. What happens when the variable \( x \) equals 0 in this expression?
2. How would the result change if \( 5x - 7x \) was \( 5x + 7x \)?
3. What does the term "like terms" mean in algebra?
4. How would you solve this equation if it were set equal to 0?
5. Can this expression represent a linear equation?

**Tip:** Always combine like terms (terms with the same variable) first when simplifying algebraic expressions.

Learn how to simplify the algebraic expression 5x - 7x + 10 + 23. This problem demonstrates how to combine like terms and simplify constants, suitable for students in Grades 6-8.

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