Add linear expressions

Remove the parentheses, then combine like terms. Write the answer as ax + b.

1. Simplify: (3x − 1) + (4x + 4). Write your answer as ax + b.
2. Simplify: (5x − 4) + (4x + 3). Write your answer as ax + b.
3. Simplify: (x + 3) + (5x − 5). Write your answer as ax + b.
4. Simplify: (2x + 5) + (4x − 4). Write your answer as ax + b.
5. Simplify: (−5x + 2) + (−x + 2). Write your answer as ax + b.
6. Simplify: (−4x + 1) + (−6x − 3). Write your answer as ax + b.
7. Simplify: (−8x + 5) + (6x + 9). Write your answer as ax + b.
8. Simplify: (−8x − 3) + (−5x − 1). Write your answer as ax + b.
9. Simplify: (−9x − 11) + (−5x + 1). Write your answer as ax + b.
10. Simplify: (−12x − 6) + (7x + 4). Write your answer as ax + b.
11. Simplify: (11x + 6) + (−5x + 3). Write your answer as ax + b.
12. Simplify: (−x + 1) + (−7x − 7). Write your answer as ax + b.
13. Simplify: (−8x + 4) + (18x + 1). Write your answer as ax + b.
14. Simplify: (−15x − 19) + (−3x − 2). Write your answer as ax + b.
15. Simplify: (−5x − 4) + (18x + 20). Write your answer as ax + b.
16. Simplify: (−7x − 17) + (−10x + 10). Write your answer as ax + b.
17. Simplify: (21x + 5) + (12x + 24). Write your answer as ax + b.
18. Simplify: (−14x − 22) + (6x − 19). Write your answer as ax + b.
19. Simplify: (−27x + 30) + (20x − 27). Write your answer as ax + b.
20. Simplify: (13x − 19) + (20x + 28). Write your answer as ax + b.