Philip P. answered 02/06/20
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11 2x-14
I---------J-------------------K
<------- 6 + x ----------->
By the Segment Addition Postulate:
IJ + JK = IK
11 + 2x - 14 = 6 + x
Solve for x then plug that value of x into the equation for JK (JK = 2x-14).