Chapter 13.7, Problem 4QCE

The sphere $x^2+y^2+z^2=9$ and the plane $x+y+z=5$ intersect in a circle that passes through the point $\left(2,1,2\right).$ Parametric equations for the tangent line to this circle at $\left(2,1,2\right)$ are

$x=\text{\_\_\_\_\_\_,}y=\text{\_\_\_\_\_\_,}z=\text{\_\_\_\_\_\_}$