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Infinitely many solutions (a,b,c)

Source: Moldova NMO 2002 grade 7 problem nr.8

October 31, 2008

Problem Statement

Prove that there are infinitely many triplets (a,b,c) (a,b,c) that satisfy the following equalities: \dfrac{2a\minus{}b\plus{}6}{4a\plus{}c\plus{}2}\equal{}\dfrac{b\minus{}2c}{a\minus{}c}\equal{}\dfrac{2a\plus{}b\plus{}2c\minus{}2}{6a\plus{}2c\minus{}2}