Simplify the following expressions:
1. (3x + 4) + (7x − 8)
2. (3x² + 6xy + 8) + (2x² − 2xy − 11)
3. (5x + 4) − (7x + 2)
4. (a − 2) − (a − 9)
5. (−x² − 4x + 5) + (5x² − 7x + 8) − (4² − 8x + 2)
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1. (3x + 4) + (7x − 8)
2. (3x² + 6xy + 8) + (2x² − 2xy − 11)
3. (5x + 4) − (7x + 2)
4. (a − 2) − (a − 9)
5. (−x² − 4x + 5) + (5x² − 7x + 8) − (4² − 8x + 2)
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2. 5x² + 4xy - 3
3. -2x + 2
4. 7
5. 4x² - 3x - 5