4. Use Gauss-Jordan Elimination (with elimination matrices) to solve the following system of equations. Please identify your steps in the process, write your solution as a set, and describe the physical shape of the solution set. 4x - 2y + 6z = 8 - 2x + y + 9z = 12 - 6x + 3y - 9z = 12 4,3,2)

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