Math

(3z^2 - 7z^3) + (9z^4 + 6z^3 - 2) - (4z^4 - 5z + 8)

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(3z^2 - 7z^3) + (9z^4 + 6z^3 - 2) - (4z^4 - 5z + 8)

3z^2 - 7z^3 + 9z^4 + 6z^3 - 2 - 4z^4 + 5z - 8

3z^2 - 7z^3+ 6z^3 + 9z^4 - 4z^4 + 5z - 8 - 2

3z^2 - z^3 + 5z^4 + 5z - 10