Let's simplify the expression \( 7 - 9X - 15 + 12X \).

1. Combine the like terms (terms with \( X \) and constant terms):

\[
7 - 15 + (-9X + 12X)
\]

2. Simplify the constants and the coefficients of \( X \):

\[
(7 - 15) + (-9X + 12X) = -8 + 3X
\]

The simplified expression is:

\[
3X - 8
\]

Would you like any more details or have any other questions? Here are some related questions you might consider:

1. How do you combine like terms in an expression?
2. What is the distributive property and how is it used in algebra?
3. How can you factor the expression \( 3X - 8 \)?
4. What are the rules for adding and subtracting polynomials?
5. How does the order of operations affect the simplification of expressions?

**Tip:** Always simplify expressions by first combining like terms, then arrange the terms in a standard form.

Learn how to simplify the expression 7 - 9X - 15 + 12X step-by-step with a detailed solution. This problem involves combining like terms and simplifying algebraic expressions. Suitable for students in Grades 7-9.

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