Question
谞转讜谉 讻讬 `1 = 1/a -(a)/(5) +(3b)/(5a) = 1/b-b/3+(7c)/(3b) = (1)/(c) - (c)/(7) + (5a)/(7c)` 诪爪讗讜 讗转 `a^2 + b^2 + c^2`.
Difficulty level (1 very easy - 10 very hard): 3
Sources:
- Israeli IMO Selection, 2025, Stage B Question 2
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