Answer Posted / sachin b. umbarkar

a+b+c=13
c+d+e=13
Thus, a+b+c=c+d+e
a+b=d+e .................(I)

e+f+g=13
g+h+i=13
Thus, g+h+i=e+f+g
h+i=e+g ...............(II)

Now add (I)and(II)
We get ,

a+b+h+i=d+g+2e
Thus,
e=(a+b+h+i-d-g)/2 .........Answer

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