Solving linear matrix system

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Having the matrix equation $XA = Z$, where $X$ and $Z$ are two constant unitary matrices, so how to solve the system to get the matrix $A$? Is the matrix $A$ unitary too?

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The inverse of a unitary matrix $\ X\ $ is its conjugate transpose $\ X^\dagger\ $. Therefore, if you multiply both sides of the equation $\ XA=Z\ $ by $\ X^\dagger\ $ you'll get $$ A=X^\dagger Z\ . $$ Since products and inverses of unitary matrices are unitary, then $\ A\ $ will also be unitary.