Solve the system using either Gaussian elimination with back-substitution or Gauss-Jordan elimination. (If there is no solution, enter NO SOLUTION. If the system has an infinite number of solutions, express x, y, z, and w in terms of the parameters t and s.) 4x+12y 7z - 20w = 28 3x + 9y5z - 28w = 34 (x, y, z, w) =

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