5. Subtract the following:
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= (x²zy + xyz + xy²z - z²xy) - (4z²xy + x²zy - 5xyz + 2xy²z)
= x²zy + xyz + xy²z - z²xy - 4z²xy - x²zy + 5xyz - 2xy²z
= 6xyz - xy²z - 5z²xy
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