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5x + 7x - 6y - 2y + 8z - 9z - 9z + 10
= 12x - 8y - 10z + 10
= 5x - 6y + 8z + 7x - 9z - 2y - 9z + 10
= 5x + 7x - 6y - 2y + 8z - 9z - 9z + 10
= 12x - 8y - 10z + 10