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4xzy^{2}
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4xzy^{2}
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\left(2xy+y^{2}-y^{2}\right)\left(xy+yz-xy+yz\right)
Combine xy and xy to get 2xy.
2xy\left(xy+yz-xy+yz\right)
Combine y^{2} and -y^{2} to get 0.
2xy\left(yz+yz\right)
Combine xy and -xy to get 0.
2xy\times 2yz
Combine yz and yz to get 2yz.
4xyyz
Multiply 2 and 2 to get 4.
4xy^{2}z
Multiply y and y to get y^{2}.
\left(2xy+y^{2}-y^{2}\right)\left(xy+yz-xy+yz\right)
Combine xy and xy to get 2xy.
2xy\left(xy+yz-xy+yz\right)
Combine y^{2} and -y^{2} to get 0.
2xy\left(yz+yz\right)
Combine xy and -xy to get 0.
2xy\times 2yz
Combine yz and yz to get 2yz.
4xyyz
Multiply 2 and 2 to get 4.
4xy^{2}z
Multiply y and y to get y^{2}.
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