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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(-3,12+3,-3,12+3);path([[0,0],[12,0],[0,9],[0,0]]);text([12/2,9/2],'15','right');text([0,9/2],'x','left');text([12/2,0],'12','below');]

`x =`  

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   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
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