contains 2. += x += 2 x incremented by 2. If it contained 2 before, it now has a value of 4. -= x -= 2 x decremented by 2. If it contained 2 before, it now has a value of 0. /= x /= 2 x divided by 2. If it contained 2 before, it now has a value of 1. *= x *= 2 x multiplied by 2. If it contained 2 before, it now has a value of 4.