Ответ:
126/2=63 р
126*4+9*63=1071 р
3 8/11 + 9 3/11 = 12 11/11 = 13
х+6 1/9 = 13
x=13- 6 1/9
13-6 1/9 = 12 9/9 - 6 1/9=6 8/9
x= 6 8/9