You do the math.
Read post #33.
Also your screen shot doesn't show the ring description, just potency chart.
I'm sure other +'s for the rest of equips will come later, like on the Chinese servers.
But right now for English servers it's only right hand weapon.
Post #32 MrGenious > Show a screen shot of the two weapons descriptions. Which would be two screen shots of the same player without having the weapons switched.
I don't think TQ would make a big red warning about right hand weapons only for nothing.
But then again there TQ.