What I gather from my database + engine combo is you transpose into a cambridge springs where Qc2 and Bb4 have been played i.e.
Semi-Slav Triangle System
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Jun 30, 2019
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#4
I don't want to insult your ability i.e. maybe you've known this from a long time ago, but black's big early middlegame achievement is often finding a way to successfully play c5 or e5. Often after dxc.
You just have to find a way to do it where you're not far behind in development and small things like you don't usually take on c4 until white's already moved the bishop, stuff like that.
So in the variation after 8.Be2 where I say black has options, I mostly mean black can already play dxc and c5 (or e5 depending on white's reply) right away. The engine will recommend other stuff, which is probably good to listen to, but it's nice to know you have options 
In the 4 Qc2 line, Black should be fine after 4 ... Bd6, 4 ... dxc4, or 4 ... Nf6.
After 4 ... Nf6 5 Bg5 (transposing to a Catalan type position with 5 g3 or 5 Nbd2 shouldn't give Black any problems either) 5 ... h6 6 Bh4 (6 Bxf6 Qxf6 when White is already in a Qc2 line is OK for Black) 6 ... dxc4 7 Qxc4 b5 8 Qc2 Bb7 should be OK for Black regardless of whether White plays 9 e3 or 9 e4.
After 4 ... Nf6 5 Bg5 (transposing to a Catalan type position with 5 g3 or 5 Nbd2 shouldn't give Black any problems either) 5 ... h6 6 Bh4 (6 Bxf6 Qxf6 when White is already in a Qc2 line is OK for Black) 6 ... dxc4 7 Qxc4 b5 8 Qc2 Bb7 should be OK for Black regardless of whether White plays 9 e3 or 9 e4.
What exactly should black do in order to equalize against the Qc2 anti-triangle line? Or is white simply better in the Qc2 anti-triangle system?