5. Решите уравнение: а) x-1 5/7 = 2 1/7; б) (12 5/13 + y) - 9 9/13 = 7 7/13.

а) x = 2 1/7 + 1 5/7 = 3 6/7

б) 12 5/13 + y = 7 7/13 + 9 9/13 = 16 16/13 = 17 3/13. y = 17 3/13 - 12 5/13 = 4 11/13