(3\7 х -5\6)* 1 целую 2\13 =2,5
(3\7 х -5\6)* 1 2\13 =2,5
3/7х - 5/6 = 2,5 : 1 2/13
3/7х-5/6 = 2 1/6
3/7х = 2 1/6 + 5/6
3/7х= 3
х=3: 3/7
х=7