(1+(-4/5)+1/1-(-4/5)):(1+1/1-(-4/5)^=((1-4/5+1)/1+4/5):(2/(1-16/25))=((6/5)/(9/5)):(2/(9/25))=1/3:50/9=3/50
(1+(-4/5)+1/1-(-4/5)):(1+1/1-(-4/5)^=((1-4/5+1)/1+4/5):(2/(1-16/25))=((6/5)/(9/5)):(2/(9/25))=1/3:50/9=3/50