4у^3-(2у^2-у+2у^3-2у^2)=4у^3-2у^2+у-2у^3+2у^2=2у^3+у
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4у^3-(2у^2-у+2у^3-2у^2)=4у^3-2у^2+у-2у^3+2у^2=2у^3+у