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Question 341·Hard·Advanced Math

The system of equations is given by

{x2+y2=25∣x∣+y=7\begin{cases} x^2 + y^2 = 25 \\[2pt] |x| + y = 7 \end{cases}

What is the sum of all possible xx-coordinates of the solutions (x,y)(x,y) to the system?