Answer
$$ = {{24\,x\,\ln \left(3\,x+1\right)+8\,\ln \left(3\,x+1\right)-27\,x \,\ln \left(2\,x-1\right)-9\,\ln \left(2\,x-1\right)-18\,x^2-6\,x- 12}\over{36\,\left(3\,x+1\right)}} $$
Explanation
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