4/3+1/2-2/3= 5/6+3/5-1/2=

4/3 + 1/2 – 2/3 = 8/6 + 3/6 – 4/6
= 7/6
5/6 + 3/5 – 1/2 = 25/30 + 18/30 – 15/30
= 28/30