4 5/19+х+1 1/38 = 12 1/2
4 10/38+1 1/38+х = 12 1/2
5 11/38+х = 12 1/2
х = 12 1/2-5 11/38
х = 12 19/38-5 11/38
х = 7 8/38
х = 7 4/19
4 5/19+х+1 1/38 = 12 1/2
4 10/38+1 1/38+х = 12 1/2
5 11/38+х = 12 1/2
х = 12 1/2-5 11/38
х = 12 19/38-5 11/38
х = 7 8/38
х = 7 4/19