( A= left[ begin array l x y z end array right], B= left[ begin array l 2 0 7 end array right], C= left[ begin array cc r-9 & 2 2 & r-2 end array right], X= left[ begin array lll 5

A=\left[\begin{array}{l} x \\ y \\ z \end{array}\right], B=\left[\begin{array}{l} 2 \\ 0 \\ 7 \end{array}\right], C=\left[\begin{array}{cc} r-9 & 2 \\ 2 & r-2 \end{array}\right], X=\left[\begin{array}{lll} 5 & 4 & 1 \\ 2 & 0 & 5 \\ 1 & 3 & 4 \end{array}\right]

MGCC 25

( A= left[ begin array l x y z end array right], B= left[ begin array l 2 0 7 end array right], C= left[ begin array cc r-9 & 2 2 & r-2 end array right], X= left[ begin array lll 5 & 4 & 1 2 & 0 & 5 1 & 3 & 4 end array right] )