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Find the difference.
1. (8s - 4) - (-7 + 2s)
2. (4c + 5d - 2) - (c + 6d+5)
3. (9x2 - 2x + 10) - (5x - 3)
4. 15a2 + 12a + 6
-3a2
3
5. -3 + 6n - 8n2 - 3n?
2 + + 4n - 5​