Length of an elastic string is x then te...

Length of an elastic string is x then tension 5N is applied and its length will be y when tension 7 N. What will be its original length ?

`(2L_(1)+L_(2))/(2)`

`(7L_(1)-5 L_(2))/(2)`

`(7L_(2)-2L_(1))/(5)`

`(7L_(2)+5L_(1))/(9)`

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