There is another command that will allow you to perform the entire Gauss-Jordan reduction process, from start to finish, in one step! It is the rref command, also located in the MATRX MATH submenu. Let's use this command to transform the original augmented matrix (still saved as matrix B) into reduced row-echelon form. Enter the command on the Home screen, followed by the matrix name.
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[MATH] 
