CSMC 2022 Part A - Question 2, CEMC UWaterloo

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This problem is tagged with csmc, csmc22, highschool.

(Canadian Senior Mathematics Contest 2022, Part A, Question 2, CEMC - UWaterloo)

If $\frac{x+y}{2} = 5$ and $\frac{x-y}{2} = 2$, what is the value of $x^2 - y^2$?

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