(x-11 7/9)+5 5/18=7 1/12

(х - 11 7/9) + 5 5/18 = 7 1/12
х - 11 7/9 = 7 1/12 - 5 5/18 = 85/12 - 95/18 = (255 - 190) /36 = 65/36 = 1 29/36
х = 1 29/36 + 11 7/9 = 65/36 + 106/9 = (65 + 424) /36 = 489/36 = 13 21/36 = 13 7/12