please solve the following question
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Step-by-step explanation:
Given DC=AB
draw BH//AD. H will be middle point of DC as AB=DH
EF//AB, FI=AB
triangle BHC and triangle BIE are similar as the corresponding sides are parallel
IE/HC=BE/BC
IE=HC×BE/BC
=Y×4X/7X
=4Y/7
EF=FI+IE=Y+4Y/7
=11Y/7
THEREFORE 7EF=11AB
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