Answer as follows
This is what they should have done
-7x -3y +x +2y
Combine like terms.
-6x -y
Their Errors - it looks like on line 2 they divided x by 2 to eliminate the 2 in 2y
Then in line 3 they split the -7 from the x and added 2 so now it’s a subtraction instead of multiply, and they reintroduced the 2y as a negative
It’s hard to figure out where they were going with this. I added a print screen to help.