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

[Graphs generated by this script: initPicture(-3,9+3,-3,9+3);path([[0,0],[9,0],[0,7.9372539331938],[0,0]]);text([9/2,7.9372539331938/2],'12','right');text([0,7.9372539331938/2],'x','left');text([9/2,0],'9','below');]

`x =`  

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