tatsach 3/7-1/2=6/14-7/14=-1/14
5 3/4:(-1/14)=23/4*(-14)=-161/2=-80.5
3*1 2/15=3*17/15=17/5=3.4
-80.5-3.4=-83.9

gravitifolz78 3/7-1/2=6/14-7/14=-1/14

5 3/4:(-1/14)=23/4*

(-14)=-161/2=-80.5

3*1 2/15=3*17/15=17/5=3.4

-80.5-3.4=-83.9