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2 + 5c^2 - 6c^4) + (4c - 9c^4 - 7)=

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2 + 5c^2 - 6c^4) + (4c - 9c^4 - 7)

2 + 5c^2 - 6c^4 + 4c - 9c^4 - 7

2 - 7 + 5c^2 - 6c^4- 9c^4 + 4c

-5 + 5c^2 - 15c^4 + 4c