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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(-3,11+3,-3,11+3);path([[0,0],[11,0],[0,10.198039027186],[0,0]]);text([11/2,10.198039027186/2],'15','right');text([0,10.198039027186/2],'x','left');text([11/2,0],'11','below');]

`x =`  

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   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
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