Can you please help and advise with this

A few steps in the process of simplifying the given matrix to row-echelon form, with Is down the diagonal 1=3 12 -2 - 3 12 from upper left to lower right, and Os below the 1s, are shown, Fill in the missing numbers in the steps that are shown 2 2 2 10 5 -2 -3 12 0 Fill in the missing numbers. 2 3 12 12 2 3 2 5