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**Lena-Jon's equation**

Lena-Jon's equation, $\sqrt{x+11}=\sqrt{5},$ is a proper radical equation because she has at least one variable under a radical sign. Additionally, she has solved it in a proper manner by squaring both sides and tested her solution.

**Ron-Jon's equation**

Ron-Jon has solved the equation correctly and tried his solution, but has not formed a radical equation. This is because he did not put any **variable** under the radical sign, only numbers. Therefore, it is Ron-Jon who made the error.