Russian | Can you solve this ? | Math Olympiad

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Russian | Can you solve this ? | Math Olympiad
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No pencil or paper needed for this one. 125+25+5=155; 5^3+5^2+5^1=155; (2^x)^3+(2^x)^2+(2^x)^1=155; 2^x=5; x=ln5/ln2

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