15цел. - 2цел. 7/16 4цел. 3/7 + 2цел. 11/14 (x-3цел. 3/2)+ 4цел. 11/12=5цел. 5/36

1)4 16/16-2 7/16=2 9/16;
2)31/7+39/14=62/14+39/14=101/14=7 3/14;
3)х-9/2=185/36-59/12;
х-9/2=185/36-177/36=8/36=2/9;
х=2/9+9/2=4/9+81/9=85/9=9 4/9;
х=9 4/9.