1. (x + 2) + (2x + 1) =
2. (3w + 5) + (4w + 4) =
3. (4x ^ 2 + 2) + (5x ^ 2 + 3) =
4. (5z ^ 2 + 4z) + (2z ^ 2 + 3z) =
5. (9y ^ 3 + y) + (3y ^ 3 + y) =
6. (3x + 2) - (x + 1) =
7. (5w + 4) - (2w + 2) =
8. (8z ^ 2 + 5) - (4z ^ 2 + 2) =
9. (7y ^ 3 + 9y) - (2y ^ 3 + 4y) =
10. (10x ^ 4 + 3x) - (5x ^ 4 + 2x) =