(5 целых 1/6-x)*2 целых 7/10-1 целая 3/14 =3 целых 2/7
(5 1/6-х)*2 7/10-1 3/14=3 2/7
(5 1/6-х)*2 7/10=3 2/7+1 3/14
(5 1/6-х)*2 7/10=46/14+17/14
(5 1/6-х)*2 7/10=63/14
(5 1/6-х)=63/14:27/10
(5 1/6-х)=5/3
х=31/6-5/3
х=31/6-10/6
х=21/6
х=3 3/6
х=3 1/2