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(3 + 2z^2 -5z^4) - (8z + 7z^4 + 4)

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(3 + 2z^2 -5z^4) - (8z + 7z^4 + 4)

3 + 2z^2 -5z^4 - 8z - 7z^4 - 4

3- 4 + 2z^2 -5z^4- 7z^4 - 8z

-1 + 2z^2 -12z^4 - 8z