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Homework Statement:
 Been studying for this thermo exam I've got coming up and I think I've been studying it all the wrong way and I could make my life a whole lot easier if I used energy balances, but I just don't understand them and how to write them! Would somebody be able to fully explain to me how to write these energy balances out and then how to simplify it down? Example question below https://imgur.com/MOvnLX6
Relevant Equations:
 Energy Balance for thermodynamics
Attempt:
No clue what equations to use from here.
No clue what equations to use from here.
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