book Maths Puzzle Numerical Ability

I have been given 2 partitioned matrices, each is 3x3, one the inverse of the other.


I 0 0 | I 0 0
C I 0 | Z I 0
A B I |

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X>9 I need help finding the value of x in the problem 7(x - 3)= 4(x = 5). Can you please walk me through the steps.