(у - 8) / 11 4/7 = (8/27) / (5 1/3),

у - 8 = 11 4/7 * 8/27 : 5 1/3,

у - 8 = 81/7 * 8/27 : 16/3,

у - 8 = 81/7 * 8/27 * 3/16,

у - 8 = 9/14,

у = 9/14 + 8,

у = 8 9/14