This video contain two examples of supermesh. Please watch until the end if you want to learn how to solve Supermesh DC circuits. If you haven't watched my videos about electrical circuits, here is the link below.
DC Circuits Playlist:
https://www.youtube.com/watch?v=6nI50dB8oxg&list=PL_NkZ6-1skglR435qV0HYRhaA3_0ZLBS0
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Reference book: Fundamentals of Electric Circuit by (Alexander and Sadiku)