Решение:

with open('9.txt', 'r') as file:
    fiel = file.read().splitlines()
c = 0
for i in fiel:
    line = sorted(map(int, i.split('\t')))
    mn = line[0]
    mx = line[-1]
    if len(set(line)) == len(line) and 3 * (mn + mx) >= 2 * (line[1] + line[2] + line[3]):
        c += 1
print(c)

Ответ: 7695