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I need help with this badly or a explanation on how to do it

I need help with this badly or a explanation on how to do it
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2 votes
I need help with this badly or a explanation on how to do it

I need help with this badly or a explanation on how to do it-example-1
User Brutus
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|DE|=5x\\\\|DF|=5x+7x=12x=108\\12x=108\\x=9\\\\|DE|=5\cdot9=45

User Margret
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