39/48-(41/48-х)=5/48

39/48-(41/48-х)=5/48
41/48-х = 39/48-5/48
41/48-х =34/48
х = 41/48 - 34/48
х = 7/48
-------------------------------
39/48-(41/48-7/48)=5/48
39/48 - 34/48 = 5/48
         5/48 = 5/48