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a4 =e, ie, a =e/4,
b/4 =e, b=4e,
c+4 =e, c=e-4,
d-4 =e, d=e+4.
put the value of a,b,c, and d in equation (1).
we get,
e/4+4e +e-4+e+4 =100
e/4 +4e +2e =100
e/4+6e =100
e(1+24/4) =100
e(25/4) =100
e =100*4/25
e =400/25
e =16
the value of e is 16.
1 5 1
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