Hoarder of erasers :o
Is this suppose to be a riddle or sum
He just switched sides of the variables and numbers. Instead if adding the opposite.
Answer:

Step-by-step explanation:

5(
+ x) would be your answer. The 5 and the parenthesis imply multiplication, and inside the parenthesis is one-half and a number being added.)
Played total n games, and lostcexactly 4:
4:n-4