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Find the length of the leg `x`. Enter the exact value, not a decimal approximation.

[Graphs generated by this script: initPicture(-3,12.124355652982+3,-3,12.124355652982+3);path([[0,0],[7,0],[0,12.124355652982],[0,0]]);text([7/2,12.124355652982/2],'14','right');text([0,12.124355652982/2],'x','left');text([7/2,0],'7','below');]

`x =`  

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