Add 3x + 6y -4z, -4y + 3z -5z and -16z-7y+8x.
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(3x + 6y - 4z) + (- 4y - 2z) + (8x - 7y - 16z)
= 3x + 6y - 4z - 4y - 2z + 8x - 7y - 16z
= 11x - 5y - 22z
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