Verified answer

Ответ:

13/60 + 6/60 - x = 9/60
x = 13/60 + 6/60
x = 19/60 - 9/60
x = 10/60

5/100 + 8/100+ x = 20/100
x = 5/100 + 8/100
x = 20/100 - 13/100
x = 7/100