Perform the following operations.
1. -3x2 + 6x3 + (-8 + 6x8)
2. b - 3b2 + b – 3b2 + 5b3
3. 14a2 +14 + 14a - (a2 +2- 3a)
4. 3a + 4a2 - 5 + 6a - 4a2
5. 3x2 + 4x3 - 5x5 - (6x2+x3-2)
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