A lot of low-end bikes use a rear derailleur with its own hanger built in. (usually found on bikes with long horizontal dropouts, using a solid axle).
You can get one for $5-15 here (great replacements for kids bikes, clunkers, work bikes, and conversions to rear shifting)
Originally Posted by The_Aleman
Nice frame, 5-7. However, I don't think those guides are for a derailleur. There seems to be no derailleur mount on that frame.
Looks like guides for an internal hub's shifter cable. Although, one doesn't often see internal-hub bikes with V-brakes...