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2. (-y+7) (y+7)
3. (2x + 5) (2x - 5)
4. (-2x + 5) (2x + 5)
5. (-a + 10) (a+10)
6. (a + 10) (a- 10)
7. (3x + 2) (3x - 2)
8. (-3x + 2) (3x + 2)
9. (-3a+ 4) (3a + 4)
10. (y + 7) (y-7)