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Answer:

2x - 14y + 9z

Step-by-step explanation:

5x - 7y + 6z - (3x + 7y - 3z)

5x - 7y + 6z - 3x - 7y + 3z

(5x - 3x) + (-7y - 7y) + (6z + 3z)

2x - 14y + 9z

2x - 14y + 9z