Ответ:
13 − 6 + 7 = 7 + 7 = 14.
6 + 6 + 5 = 12 + 5 = 17.
3 + 8 − 4 = 11 − 4 = 7.
12 − 5 + 8 = 7 + 8 = 15.
15 − 6 + 3 = 9 + 3 = 12.
12 + 4 − 7 = 16 − 7 = 9.
13 − 6 + 7 = 7 + 7 = 14.
6 + 6 + 5 = 12 + 5 = 17.
3 + 8 − 4 = 11 − 4 = 7.
12 − 5 + 8 = 7 + 8 = 15.
15 − 6 + 3 = 9 + 3 = 12.
12 + 4 − 7 = 16 − 7 = 9.