2021xyz + 2020xy + 21xyz - 10³xy - √1764 xyz
= 2021xyz + 21xyz - √1764 xyz + 2020xy - 10³xy
= 2021xyz + 21xyz - 42xyz + 2020xy - 1000xy
= (2021 + 21 - 42)xyz + (2020 - 1000)xy
= 2000xyz + 1020xy
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2021xyz + 2020xy + 21xyz - 10³xy - √1764 xyz
= 2021xyz + 21xyz - √1764 xyz + 2020xy - 10³xy
= 2021xyz + 21xyz - 42xyz + 2020xy - 1000xy
= (2021 + 21 - 42)xyz + (2020 - 1000)xy
= 2000xyz + 1020xy