Simple System of Equations Part 1

Algebra Level 2

\[\begin{eqnarray} x(y+z)&=&39\\ y(x+z)&=&60\\ z(x+y)&=&63 \\ x^2+y^2+z^2&=& \ ? \end{eqnarray} \]

See Part 2 and Part 3.

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