2x + 1 + 3x + 4 + (–2) 2x + 2 + 3 x x – 11. 12. 13. + 1 + 2x + + + 3 + 4x –3x –x –3 –2x –x 14. 15. 16. + 4 + 7 4x 3 + 2 2x 1 + 3x + 2 x x –2x – – –4x – – 18. 19. + + + x x x x x x x x x x x – – – –x – – –
2x + 1 + x 3x + 4 + (–2) 2x + x – 2 + 3 11. –3x + 1 + –x 12. 2x + –3 + –2x 13. –x + 3 + 4x 14. –2x + 4 + x 7 15. 4x – 3 + 2 – 2x 16. –4x – 1 + 3x + 2 – x x + x + x + x 18. x – x – x – x 19. –x – x – x – x