Is My Mechanics of Materials Solution Correct?

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mohamadh95
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So basically I'm not sure of the solution and just want someone to tell me if what I did is correct. It's important I have an upcoming exam. Thank you.
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Your shortening of bar B-C looks ok.
Your shortening of bar A-B should contain two terms: one expression for the un-drilled portion and one expression for the drilled portion. The latter term will contain your unknown dimension.