Get the hanger checked and aligned.
Looks like a long to me - if it's a 3X10 then it will be a long.
From my notes:
My Long cage X7 is 4" between jockey wheel bolts.
My medium cage X7 is 3" between jockey wheel bolts.
X-9 10-speed rear derailleur on the SRAM website - they are listed as 55mm, 75mm, and 99mm for the short, medium, and long versions.
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