Ответ:
12 + 33 + 44 = 45 + 44 = 89
41 + 22 + 23 = 63 + 23 = 86
55 + 23 + 11 = 78 + 11 = 89
13 + 54 + 31 = 67 + 31 = 98
798:57= 14
714:34= 21
252:14= 18
897:39= 23
2548:26= 98
7644:26= 294
5808:66= 88
8712:88= 99
455:13= 35
688:16= 43
528:22= 24
345:15= 23
4656:97=
6348:69= 92
2720:32= 85
3510:45=78
(16-8)*9=8*9=72
(8-4)*9=4*9=36
9:3*6=3*6=18
(13-5)*8=8*8=64
7*(3+4)=7*7=49
(28+7):5=35:5=7
576+79у=127у
79у-127у=-576
-48у=-576
у=12