3x²z-4yz+3xy- {x²z-(x²z-3yz)-4yz -7z}
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3x²z-4yz+3xy- {x²z-(x²z-3yz)-4yz -7z}
= 3x²z - 4yz + 3xy - {x²z - x²z + 3yz - 4yz - 7z}
= 3x²z - 4yz + 3xy - {-yz - 7z}
= 3x²z - 4yz + 3xy + yz + 7z
= 3x²z - 3yz + 3xy + 7z
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