Answer:
-24
Step-by-step explanation:
First multiply the 1st matrix on the left hand side , so it becomes
[tex]\left[\begin{array}{ccc}-24\\12\end{array}\right] =\left[\begin{array}{ccc}x\\12\end{array}\right][/tex]
or , -24=x
as both matrix have same number of row and collumns and same numbers of entry and we can see that both side has exact same entry 12 at the same position , therefore the other entry for both matrices has to be same
