Answer:
8x + 4y
here's your solution
=> (10x + 3y) - (2x - 4y)
=>. now multiple - to (2x - 4y)
=> hence we get -2x + 4y
=> now put this in above
=> 10x +3y -2x + 4y
=> solve for common terms
=> 8x + 7y
hope it helps
