Solve the system using either Gaussian elimination with back-substitution or Gauss-Jordan elimination (If there is no solution, enter NO SOLUTION. I the system has an infinite number of solutions, express x, y, and z in terms of the parameter t.).

3x + 3y 12z = 6
x+y+ 4z= 2
2x + 5y + 20z = 10
-x+2y+ 8z = - 4

(x, y, z)=____