(1 1\4 + х): 1 4\5 -1\3=1\2
(1 1\4 + х): 1 4\5 =1/2+1/3
(1 1\4 + х): 1 4\5 =5/6
1 1\4 + х=5/6*9/5
1 1\4 + х=3/2
х=3/2-5/4
х=6/4-5/4
х=1/4