(5 1/6 - х) * 2 7/10 - 1 3/14 = 3 2/7
(5 1/6 - х) * 2 7/10 =1 3/14 + 3 2/7
(5 1/6 - х) * 2 7/10 =1 3/14 + 3 6/14
(5 1/6 - х) * 2 7/10 =4 9/14
5 1/6 - х=4 9/14 :2 7/10
5 1/6 - х=65/14 :27/10
5 1/6 - х=65/14 *10/27
5 1/6-х=325/189
х=5 1/6-325/189
х=5 1/6-1 136/189
х=5 63/378-1 272/378
х=4 441/378-1 272/378
х=3 169/378