Use Gauss-Jordan row reduction to solve the given system of equations. HINT [See Examples 1-6.) (If there is no solution, enter NO SOLUTION. If the system is dependent, express your answer in terms of z, where $x = x(z)$ and $y = y(z)$.)
$6x - y + z = 6$
$7x - y + z = 6$
$(x, y, z) = (2y - 6 + y)