17.  Using elementary row transformations, find the inverse of the following matrix:

3 4 2 0 2 - 3 1 - 2 6

or
I f   A = 2 1 3 4 - 1 0 - 7 2 1 ,   f i n d   A - 1   a n d   h e n c e   s o l v e   t h e   f o l l o w i n g   s y s t e m   o f   e q u a t i o n s : 2 x + y + 3 z = 3 4 x - y = 3 - 7 x + 2 y + z = 2

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