Isolating A Single Variable!

Algebra Level 2

{x+y+z=15xy+yz+xz=72 \large {\begin{cases} x+y+z&=15 \\ xy+yz+xz&=72 \end{cases} }

Let x,y,x,y, and zz be real numbers satisfying the system of equations above.

Find the possible range of xx.

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