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50 Cent Calls In Backup For Chris Brown ... How Bout Mike Tyson?

50 Cent is pulling some serious favors to ensure Chris Brown comes out with a 'W' if he and Soulja Boy square up ... calling none other than Mike Tyson to train CB.

50 posted the vid claiming he's speaking with Iron Mike -- the two yak it up pretty heavy -- and one thing's apparent ... they're both in Chris' corner.

Check out the vid ... Mike's got a bold prediction on how he thinks the fight will go.