14 9/16-х=6 3/4+1 2/5;
14 9/16-6 3/4- 1 2/5=х;
14 9/16-6 12/16- 1 2/5=х;
13 25/16-6 12/16-1 2/5=х;
7 13/16-1 2/5=х;
7 65/80-1 32/80=х;
6 34/80=х;
6 17/40=х