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X1 4. (X+1)2+x2=15/x2+x+1. 4-X=1+4x. X^4-1. X+4/X-1=0.
(X+1)2+x2=15/x2+x+1. 4-X=1+4x. X^4-1. X+4/X-1=0.

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