Решение:

with open('9.txt', 'r') as file:
    f = file.read().splitlines()
count = 0
for i in f:
    numbers = sorted(map(int, i.split('\t')))
    a = (numbers[0] + numbers[1] == numbers[2] + numbers[3])
    b = (numbers[0] + numbers[2] == numbers[1] + numbers[3])
    c = (numbers[2] + numbers[1] == numbers[0] + numbers[3])
    if numbers[-1] < sum(numbers[:-1]) and (a or b or c):
        count += 1

print(count)

Ответ: 128