Hey, Guys...the following problem from IMO 1959, the very first: Prove that the fraction (21n+4)/(14n+3) is irreducible for every natural number n.(adsbygoogle = window.adsbygoogle || []).push({});

...just can't get what is meant by the given solution: 3(14n+3)-2(21n+4)=1...I mean, what is their "sample" method?!...can't see through...tried to get the same...no chance.

Please, help!

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# A fraction

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