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Answer variants:
\(-8x^2y^2\)
\(8x^2y^2z\)
\(8x^3y\)
\(4xy\)
\((-5)\)
\(x\)
\(2x^2\)
\(-2xy\)
\(x^4y^3\)
\(4x^5y^4\)
\(2xyz\)
 
\(xy^2\)
\(-20x^2yz^2\)