4 5/14+(5 1/12-3 4/21)=???
=6 1/4
4 5/14+(5 1/12-3 4/21)= 4 5/14+(5 7/84-3 16/84)= 4 5/14+ 1 75/84= 4 30/84+1 75/84= 5 105/84= 6 21/84= 6 1/4= 6,25