Given matrices .

And .

Here to find  X, no need to have the matrix C.

We have .

.          

So, now find inverse matrix of A and multiply it with B.

.

Now cofactor matrix of A is

If , then

Therefore,

.

Now is

Now find .

Since ,  .

The matrix set up is

You can also check this answer by doing AX which is equal to B.

The matrix of X is .