The document contains several algebraic expressions combined using addition and subtraction. The expressions include like and unlike terms being combined, as well as expressions within parentheses. The document simplifies each combination of terms to yield a single expression on the right side of the equal sign.

1. x+x
2x
x·x
2
x

2. 2x + 3x
2x·3x
5x
6x
2

3. 4x + 4x
NOT
LIKE
TERMS!
2
4x ·4x
2
16x
3

4. 5x + x
2
6x
2
2
5x ·x
2
5x
4
2

5. (3x – 5x + 1) + (6x + 2x – 7)
4
2
4
2
9x – 3x – 6
4
2

6. (r + 2r – 3) + (3r – r – 1)
2
2
4r + r – 4
2

7. (-2a5 – 2a4 + 7a) + (6a4 + 2a2 – 2a)
-2a + 4a + 2a + 5a
5
4
2

8. (-c5 + 8c + 2) – (-2c5 + 6c – 1)
–
(-c5 + 8c + 2) + (2c5 – 6c + 1)
c + 2c + 3
5