You have the following equation:
e + 3/8 = 2
in orderto solve for e, proceed as follow:
e + 3/8 = 2 subtract 3/8 both sides
e = 2 - 3/8
e = (16 - 3)/8
e = 13/8
as a mixed number you otbain for e:
e = 1 5/8
