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1. 
2a + 3a + 5a - 10a -4a + 3a
2. 
-b + 3b - 6b + 8a +10b
3. 
c^2 + 3c^2 - 3c - 6c
4. 
-3d^3 + 3d^3 + 1
5. 
2e^2 + 3e^3 - 6e