53,5-14 1/6•1 1/17+8 2/3

14 1/6 * 1 1/17 = 85/6 * 18/17 = 15
53,5 - 15 + 8 2/3 = 38,5 + 8 2/3 = 38 1/2 + 8 2/3 = 46 + (1/2 + 2/3) = 
46 + (3/6 + 4/6) = 47 1/6