The expression \( a - 3a \) simplifies by combining like terms. Here's how:

1. Start with the expression: 
   \[
   a - 3a
   \]

2. Factor out the common variable \( a \):
   \[
   a(1 - 3)
   \]

3. Simplify inside the parentheses:
   \[
   a(-2) = -2a
   \]

So, \( a - 3a \) simplifies to \( -2a \).

Would you like further details on this simplification, or do you have any questions?

Here are 5 related questions to explore further:

1. How do you simplify \( 5a - 2a \)?
2. What happens when you add similar algebraic terms like \( 4x + 7x \)?
3. How do you factor expressions such as \( 2b - 6b \)?
4. What is the result of subtracting \( 3y \) from \( y \)?
5. How do you simplify expressions involving more than one variable, like \( x + 2y - 3x + 4y \)?

**Tip:** When simplifying algebraic expressions, always combine like terms by adding or subtracting the coefficients.

Learn how to simplify the algebraic expression a - 3a step-by-step. This problem involves combining like terms and factorization techniques. Suitable for students in Grades 6-8.

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