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( A= left[ begin array ccc 1 & 2 & -3 -2 & 1 & 0 end array right], B= left[ begin array rr -1 & 2 -3 & 7 5 & 0 end array right], C= left[ begin array rr 5 & 1 1 & -3 end array righ | Suva Ai