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Verified Answer :

bartdrinksmalk

EF is halfway between AD and BC.

Using the midpoint formula:
\(4x=\frac{(x+6)+57}{2}\)
⇒\(4x=\frac{x+63}{2}\)
⇒\(8x=x+63\)
⇒\(7x=63\)
⇒\(x=9\)

EF is \(4x=4(9)=36\)

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