2/5+2/3-2/5=(2/5-2/5)+2/3=0+2/3=2/3
=2/5-2/5+2/3=(2-2)/5+2/3=0+2/3=2/3
2/5+2/3-2/5=2/5-2/5+2/3=0+2/3=2/3