<<< native [ EDelimited "(" ")" [ Right (EGrouped [ EIdentifier "a" , ESymbol Bin "+" , EIdentifier "b" ]) ] , ESymbol Bin "+" , EDelimited "(" ")" [ Right (EFraction NormalFrac (ENumber "1") (ENumber "2")) ] ] >>> eqn left ( {a + b} right ) + left ( 1 over 2 right )