HELP NOW. Reduce the matrix.

A=⎡⎣⎢11111−142−21410−6⎤⎦⎥
to reduced row-echelon form.

⎡⎣⎢⎢⎢⎢⎢⎢
⎤⎦⎥⎥⎥⎥⎥⎥