(1 1/4 + х ) / 1 4/5 = 1/2 + 1/3
(1 1/4 + х ) / 1 4/5 = 5/6
(1 1/4 + х ) = 1 4/5 * 5/6
(1 1/4 + х ) = 1 1/2
х = 1 1/2 - 1 1/4
х = 1/4 или 0.25
