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(7k^4 + 4) - (3k^4 + 9 - 5k^3) + (2k^3 - 6k)

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(7k^4 + 4) - (3k^4 + 9 - 5k^3) + (2k^3 - 6k)

7k^4 + 4 - 3k^4 - 9 + 5k^3 + 2k^3 - 6k

7k^4 - 3k^4 - 9+ 4 + 5k^3 + 2k^3 - 6k

4k^4 -5 + 7k^3 - 6k