(adsbygoogle = window.adsbygoogle || []).push({}); Please help on solving these difficult equations

In the pdf document I attached there are equations numbered (12) ,(13), (14).

These are similar equations.

I want to find a way to iteratively solve the equation number (13).

I was told that this equation can be rearranged to the form, "Ax=B".

Please help me on re-arranging the terms of this equation to this form.

Thank you.

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# Please help on solving these complex equations

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