well im stuck on this matrices, the question says reduce the matrix to its reduced echelon form... unfortunately I missed last lecture and don't know this material.. if anyone can solve and showing each step it would help a ton, thanks.

reduce the matrix to its reduced echelon form:

[ 1 4 -2 |7]

[ 2 5 2 |2 ]

[ 0 3 2 |5 ]