-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?
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-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?-3xy(x^
-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?
-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?
-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?
-3xy(x^2-2x-1)+(2x-3y)(3x-4y)
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