I Think you meant: A football team gains (Games) 3 yards in the first play, loses ( Lisa's ) 6 yards on the second play, loses 4 yards on the third play ( plate ), and gains 5 yards on the fourth play (foreplay). What is the team's overall gain or loss for all four plays
Net (loss/gain) = +3 - 6 - 4 + 5 = - 2 , the net yards is a loss of 2 yards
In parenthesis is what you wrote, you need to work on your vocabulary a bit.