3d Geometry

Let the plane P pass through the intersection of the planes \(2x+3y-z=2\) and \(x+2y+3z=6\), and be perpendicular to the plane \(2x+y-z+1=0\). If d is the distance of P from the point (\(-\)7, 1, 1), then \(\mathrm{d^{2}}\) is equal to :