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Correct Answer: 17/8

Given,

3x+y=51

= 3x+y=34

= x + y = 4 …(i)

and 81x−y=3 or (34)x−y=31

= x−y=1/4 …(ii)

On solving the Eqs. (i) and (ii), we get

2x=17/4=x=17/8