х = -84
1 1
--- х + 7 = 16 + --- х
28 7
1 4
--- х - --- х = -7 + 16
28 28
3
- --- х = 9
28
3 9 28
х = 9 : - --- = -- * - --- = -84
28 1 3
Проверка:
-3 + 7 = 16 + -12
4 = 4
