I see that you’ve uploaded an image containing an algebraic expression. Let's analyze it together. The expression in the image appears to be:

$6x - 9y - 7x + \_\_\_ \quad \text{and below it:} \quad \_\_\_ - 15y$

To proceed:

Step 1: Simplify the expression by combining like terms.

• Combine the $x$-terms: $6x - 7x = -x$
• Combine the $y$-terms: $-9y$ and $-15y$

Thus, the expression simplifies to:

$-x - 9y + \_\_\_ - 15y$

Would you like to proceed with the rest of the steps, or would you like further clarification on this part?

Here are 5 related questions to deepen your understanding:

1. How do you combine terms in an expression involving multiple variables?
2. What is the significance of like terms in algebra?
3. How can you simplify expressions with both positive and negative terms?
4. Why is combining like terms a key step in simplifying algebraic expressions?
5. How do operations with variables differ from operations with constants?

Tip: Always combine terms with the same variable first before moving to constants when simplifying expressions.