(-3/5)+(-2/5)=-1(+1/5)+(-4/5)=-3/5(-3/8)-1/2=-7/81/6-(-2/3)=5/6(+21/5)+(-4/5)=17/50.5+(-3/4)=1/2+(-3/4)=-1/4(5.25)+(1/2)=21/4+(1/2)=23/4