Find the missing length indicated.

I'm not sure how to set this equation up. I don't need it solved, just sat up with a helpful explanation! Thank you! This is Proportions Theorems and I'm not sure which applies here.

Find the missing length indicated Im not sure how to set this equation up I dont need it solved just sat up with a helpful explanation Thank you This is Proport class=

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i found this and it was notes from decomposing
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