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-- Mathematics - Section B1
Matrices
If A is a matrix and $|A|≠0$, then solution of the equation $XA = B$ is:
$X=A^{-1}B$
$X=\frac{1}{|A|}B$
$X=BA^{-1}$
$X=AB^{-1}$
$A→|A|≠0$
$XA=B$ (post multiplying with $A^{-1}$)
$XAA^{-1}=BA^{-1}$