<<< mml $$\frac{4}{2+\frac{3}{1+\frac{1}{2}}}=\frac{1+\frac{9}{2+\frac{1}{4}}}{5}$$ >>> native [ EFraction NormalFrac (ENumber "4") (EGrouped [ ENumber "2" , ESymbol Bin "+" , EFraction NormalFrac (ENumber "3") (EGrouped [ ENumber "1" , ESymbol Bin "+" , EFraction NormalFrac (ENumber "1") (ENumber "2") ]) ]) , ESymbol Rel "=" , EFraction NormalFrac (EGrouped [ ENumber "1" , ESymbol Bin "+" , EFraction NormalFrac (ENumber "9") (EGrouped [ ENumber "2" , ESymbol Bin "+" , EFraction NormalFrac (ENumber "1") (ENumber "4") ]) ]) (ENumber "5") ]