х = 595/72 = 8 целых 19/72.
Пошаговое объяснение:
(3/7 х - 5/6) · 12/13 = 2.5
(3/7х - 5/6) = 2 1/2 : 12/13
3/7х - 5/6 = 25/10 · 13/12
3/7х - 5/6 = 325/120
3/7х = 325/120 + 5/6
3/7х = 85/24
х = 85/24 : 3/7
х = 85/24 · 7/3
х = 595/72
х = 8 19/72
