Going from $X^tAB - I = X^t$ to $X^t(AB-I) = I$ in matrix algebra.

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Finding the value of the matrix $X$:

$$X^tAB - I = X^t$$

I noticed that the next step chosen by my book is

$$X^t(AB-I) = I$$

It's not clear to me how did they reach that. How did they go from one step to the other, exactly?

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This is just:$$X^tAB - I = X^t \iff X^tAB - X^t = I \iff X^t(AB - I) = I $$