The three algebraic expressions you provided are:

1. \( a + b - c \)
2. \( 2a + 2b - 2c \)
3. \( -3a - b + 3c \)

Here’s what can be observed:

- The second expression is simply double the first one.
- The third expression introduces a negative coefficient for \(a\), \(b\), and a positive coefficient for \(c\).

### Simplifications:
1. \( a + b - c \) – Already in simplest form.
2. \( 2a + 2b - 2c \) – Factor out the common factor of 2:  
   \[
   2(a + b - c)
   \]
3. \( -3a - b + 3c \) – Already in simplest form, no common factor.

Would you like to combine these expressions or explore another aspect?

### Related Questions:
1. Would you like to solve for specific values of \(a\), \(b\), and \(c\)?
2. Should these expressions be added or subtracted from one another?
3. Would you like to factor out common terms between these expressions?
4. Do you need help with a specific operation like solving or simplifying?
5. Would you like to explore how these expressions relate in a graph?

**Tip:** Always look for common factors in algebraic expressions to simplify them efficiently!

This page provides step-by-step instructions on how to simplify the algebraic expressions a + b - c, 2a + 2b - 2c, and -3a - b + 3c by factoring and identifying common terms. Suitable for middle school students in Grades 6-8 studying basic algebraic concepts.

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