13/60 + 6/60 - х = 9/60
19/60 - х = 9/60
х = 19/60 - 9/60
х = 10/60
5/100 + 8/100 + х = 20/100
13/100 + х = 20/100
х = 20/100 - 13/100
х = 7/100
13/60 + 6/60 - х = 9/60
19/60 - х = 9/60
х = 19/60 - 9/60
х = 10/60
5/100 + 8/100 + х = 20/100
13/100 + х = 20/100
х = 20/100 - 13/100
х = 7/100