4/5+2 1/7+1 1/5+3 6/7
=8
4/5+2 1/7+1 1/5+3 6/7=(2+1+3)+(4/5+1/7+1/5+4/5)=6+(7/7+5/5)=6+1+1=8
4/5+2 1/7+1 1/5+3 6/7=(4/5 + 1 1/5) + (2 1/7 + 3 6/7) = 1 5/5 + 5 7/7 = 2 + 6 = 8