Please help explain the computer evaluation in this position.

This was a 3I0 blitz game. The opponent was slow and flagged in this the final position. When I put it in the engine, the computer evaluated the final position at +5 for white.

I didn't get it. The pieces are exactly equal. White does have an advantage with the pawn on d6 but that pawn is going nowhere for now.

So could you please help explain why the position is so strongly in favor of white. Also just to see the advantage I chose to finish the game from this point on against the chess.com computer. I felt that with equal pieces the computer at 10 would crush me.

However I was able to win rather easily. Which means that the advantage must have been really decisive. But I just don't why.

Its not how much material you have, its what you do with the material you do have.  Whites advantages are numerous:

Deep passed pawn, that causes a rook to defend.  Now you have a rook doing nothing but defending a passed pawn.

Better minor piece.  the bishop is active, and the knight?  Well...not so much.  

Whites rook, and queen are much more active, compared to blacks.  

Whites king is much safer, compared to blacks.

White can create threats on the a-file, white can play c4 at some point, and essentially freeze blacks queenside pawn majority, blacks pawns are all on dark squares where they are vulnerable to the bishop.  

Thats just what i see...

axb cxb (probably not best, but since the OP likes to keep material equal) then Bd4 and find a move for black... white is probably checkmating in a few moves.

Oh, but it's black to move... ok, but there are almost no moves, so whatever black does just do that. Yeah, that eval makes sense.

Try playing the position out against yourself, then play it against an engine. You'll figure it out pretty quickly.