Start by putting both teams peering around the corner of the street covered by the RPG dude. Use suppressive fire on the left side of the street, and include the RPG inside the cone of fire.
Move your second team behind the dumpster on the right. Cancel your fire order of the first team, and order the second team to suppress the RPG with fire. Move your first team into the first alley on the left. When they get to the opening of the first alley, order them to bound to the corner facing the end of the alley (behind a dumpster located in this alley), as there will be a terrorist who appears there.
Now bound your second team facing the RPG to the first teams location. Kill the terrorist with a frag, or by flanking and move around the corner of the alley.
Sometimes there's a second terrorist, kill him if you can...otherwise he'll ambush you later.
Move your teams around the next corner, and use smoke to cross the rpg-street to the alley across from you. If you didn't kill that second terrorist, he'll be behind a vehicle in the entrance to this next alley. Also, when moving across the street to the new alley, keep one team covering your rear, as you may be followed by another terrorist.
This should give you a headstart. If you need more help, let me know.