5/12 - 7/9 х = 10целых 5/12 - 3х
3х - 7/9х = 125/12 - 5/12
2целых 2/9 х = 120/12
20/9 х = 10
х = 10: 20/9
х = 20* 9/10 = 18
5/12 - 7/9 х = 10целых 5/12 - 3х
3х - 7/9х = 125/12 - 5/12
2целых 2/9 х = 120/12
20/9 х = 10
х = 10: 20/9
х = 20* 9/10 = 18