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Disk scheduling problem

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disk requests come to disk driver for cylinder 10,22,20,2,40,6,X in that order at a time when the disk drive is reading from cylinder 20 the seek time is 6ms per cylinder if the total seek time 876ms under fcfs scheduling algorithum then what is the value of x??
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total seek=20-10+22-10+22-20+20-2+40-2+40-6+x-6=108+x

(108+x)6=876

648+6x=876

6x=228

x=38
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