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vineri, 15 octombrie 2021

First problem of https://www.facebook.com/Matem%C3%A1tica-preuniversitaria-111349621225123/photos/pcb.135514875475264/135514668808618/

 A solution, out of scheduled training



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https://artofproblemsolving.com/community/c6h616123p3670325

 This is my synthetic proof to the subject problem: