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We have: PZ = 1/2 XZ ( Z is the middle point of XZ )
=> 22 = 1/2(5x - 11)
=> 1/2(5x - 11) = 22
=> 5x - 11 = 22 : 1/2
=> 5x - 11 = 44
=> 5x = 44 + 11
=> 5x = 55
=> x = 55/5 = 11
ANSWER: x = 11
Ok done. Thank to me :>