5 5/7х : 2 8/9 = 4 2/13 : 1 9/19
5 5/7х * 1 9/19 = 2 8/9 * 4 2/13
40/5х * 28/19 = 26/9 * 54/13
40/5х * 28/19 = 12
40/5х = 12/1 * 19/28
40/5х = 8 1/7
х = 57/7 * 1/8
х = 57/56
х = 1 1/56
5 5/7х : 2 8/9 = 4 2/13 : 1 9/19
5 5/7х * 1 9/19 = 2 8/9 * 4 2/13
40/5х * 28/19 = 26/9 * 54/13
40/5х * 28/19 = 12
40/5х = 12/1 * 19/28
40/5х = 8 1/7
х = 57/7 * 1/8
х = 57/56
х = 1 1/56