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Collecting like terms

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	Answers
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Simplify the following, where possible, by collecting the like terms.

1. 6p + 4z + 2p + 7z
2. 9x + 7p -4x -2p
3. 6z + 5q -2z -7q
4. 11zy + 8yz
5. 5p + 2p^{2} + 9p + 7p^{2}
6. 9z + 5
7. 6y + 5yq -3y -8qy
8. 7x + 3p
9. 6q -2
10. 8yx + 13px + 19pz + 10xp
11. x + 8x^{2} + 6x^{3} -7x
12. 5z + 4y -14z -13y