Let's simplify the expression step by step:

\[
7 - 9x - 15 + 12x
\]

1. Combine the constant terms:  
\[
7 - 15 = -8
\]

2. Combine the \(x\)-terms:  
\[
-9x + 12x = 3x
\]

Now, the simplified expression is:

\[
3x - 8
\]

Would you like further clarification or any additional details?

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**Tip:** Always combine like terms (constants and variable terms) first when simplifying an algebraic expression.

Learn how to simplify the algebraic expression 7 - 9x - 15 + 12x step-by-step. This problem involves combining like terms and is suitable for students in Grades 7-9. A clear breakdown of constants and variable terms is provided.

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