I think 7x-y=-2 is the answer
2940. To find LCM, listing the multiples may help. Then you will easily be able to view them and circle when you find a common one. :)
Let
x---------> the thickness of the frame in feet
At-------> Area of the mirror and the frame in square feet
we know that
------> equation 
--------> equation 
equate equation
and equation 

therefore
the answer is the option

Answer:
67 bc its has eacdk irbrjr krodod8 irirururururudhr rkjrir