Consider the array with matrix A on the left and matrix I on the right. Could i please have some assistance on performing the elementary row operations on the array, so the left hand half of the matrix becomes I and hence A inverse is deduced from the right half of the array.

0 -1 -2 1 0 0

1 1 4 0 1 0

1 3 7 0 0 1

...

...

...

1 0 0 ? ? ?

0 1 0 ? ? ?

0 0 1 ? ? ?

Thankyou in advance for any assistance provided.