To combine like terms in the first half of an expression, you group terms that have the same variable(s) raised to the same power(s). Here's an example process:

Example Expression:

5x + 3y - 2x + 7y

Combine like terms in the first half:

In this case, the first half involves 5x + 3y - 2x. Combining the like terms:

1. Combine the terms with x: $5x - 2x = 3x$.
2. Leave the $3y$ as is because there are no other $y$-terms in this half.

Result for the first half: $3x + 3y$

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If you provide a specific expression, I can show you the exact process step-by-step. Let me know if you have more details!

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Related Questions:

1. What are the rules for combining like terms in polynomials?
2. Can you explain how to deal with coefficients when combining terms?
3. How do parentheses affect combining like terms?
4. What if the terms involve exponents or roots—how does that change the process?
5. Are there scenarios where you can’t combine terms? Why?

Tip: Always check the sign in front of each term when combining like terms—it’s easy to overlook negative signs!