<<< native
[ EDelimited
    "("
    ")"
    [ Right
        (EGrouped
           [ EIdentifier "x"
           , ESymbol Pun ","
           , EFraction NormalFrac (EIdentifier "y") (EIdentifier "z")
           ])
    ]
, ESymbol Bin "+"
, EDelimited
    "("
    ")"
    [ Right
        (EGrouped
           [ EIdentifier "x"
           , ESymbol Pun ","
           , EFraction NormalFrac (EIdentifier "y") (EIdentifier "z")
           ])
    ]
, ESymbol Bin "+"
, EDelimited
    "("
    ")"
    [ Right
        (EGrouped
           [ EIdentifier "x"
           , ESymbol Pun ","
           , EFraction NormalFrac (EIdentifier "y") (EIdentifier "z")
           ])
    ]
]
>>> tex
\left( {x,\frac{y}{z}} \right) + \left( {x,\frac{y}{z}} \right) + \left( {x,\frac{y}{z}} \right)