4x(7y-3x^2)-3y(x-y^2)=28xy-12x^3-3xy+3y^3=
-12x^3+25xy+3y^3.
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4x(7y-3x^2)-3y(x-y^2)=28xy-12x^3-3xy+3y^3=
-12x^3+25xy+3y^3.