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[(2(2x+1)^2+(2x+1))/(3((2x+1)+1))]-[(2x^2+x)/(3(x+1))+2x+2]
[(2(2x+1)^2+(2x+1))/(3((2x+1)+1))]-[(2x^2+x)/(3(x+1))+2x+2]
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