4/5-3/10+2/3=24/30-9/30+20/30=24-9+20/30=35/30=7/6
4/5-3/10+2/3=8/10-3/10+2/3=5/10+2/3=1/2+2/3=3/6+4/6=7/6
4/5-3/10+2/3 =24/30-9/30+20/30 =45/30 =3/2
