The expression \( 3x + 5x \) can be simplified by combining like terms:

\[
3x + 5x = (3 + 5)x = 8x
\]

So, the simplified expression is:

\[
8x
\]

Would you like more details or have any questions?

Here are 5 related questions:
1. How do you simplify expressions with multiple variables?
2. What happens if you have different variables, such as \(3x + 5y\)?
3. Can you factor an expression like \(8x\)?
4. How do you solve an equation like \(8x = 16\)?
5. What is the next step if the equation has more terms, such as \(8x + 7 = 0\)?

**Tip:** When combining like terms, make sure the variables and their exponents are the same.

Learn how to simplify the algebraic expression 3x + 5x by combining like terms. This example demonstrates key concepts in algebra, making it suitable for students in Grades 6-8.

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