(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
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(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
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