Matrix Equation - Make X the Subject I'm having a complete mind blank here even though i'm pretty sure the solution is relatively easy.
I need to make X the subject of the following equation:
$$AB - AX = X $$
All i've done so far is:
$$A(B-X) = X$$
$$B-X = A^{-1} X$$
Not sure if thats right?
Thanks in advance.

Whatever you have written is correct if inverse of A exists.
Hint for another way of writing an expression for $X$: $AB = (I+A)X.$
