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((2 x+1) (-(2 (x^2+3 x+2))/(x+4)+((x+2)^2)/(2 x+5)+1/3 (x+1)^2))/(x+1)^4
((2 x+1) (-(2 (x^2+3 x+2))/(x+4)+((x+2)^2)/(2 x+5)+1/3 (x+1)^2))/(x+1)^4
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