(-3/5)+(-2/5)=-1
(+1/5)+(-4/5)=-3/5
(-3/8)-1/2=-7/8
1/6-(-2/3)=5/6
(+21/5)+(-4/5)=17/5
0.5+(-3/4)=1/2+(-3/4)=-1/4
(5.25)+(1/2)=21/4+(1/2)=23/4
(-3/5)+(-2/5)=-1
(+1/5)+(-4/5)=-3/5
(-3/8)-1/2=-7/8
1/6-(-2/3)=5/6
(+21/5)+(-4/5)=17/5
0.5+(-3/4)=1/2+(-3/4)=-1/4
(5.25)+(1/2)=21/4+(1/2)=23/4