<<< native [ EFraction NormalFrac (EGrouped [ EIdentifier "x" , ESpace (7 % 20) , EIdentifier "y" ]) (ENumber "2") , ESymbol Bin "+" , EFraction NormalFrac (ENumber "2") (EGrouped [ EIdentifier "x" , ESpace (0 % 1) , EIdentifier "y" ]) , ESymbol Bin "+" , EFraction NormalFrac (EGrouped [ EIdentifier "x" , ESpace (0 % 1) , EIdentifier "y" ]) (ENumber "2") ] >>> eqn {x fwd 35 y} over 2 + 2 over {x fwd 0 y} + {x fwd 0 y} over 2