<<< native
[ EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ EGrouped [ ENumber "12" , EIdentifier "x" ] ]
             , [ ENumber "0" ]
             ]
           , [ [ ENumber "0" ] , [ ENumber "117" ] ]
           ])
    ]
]
>>> eqn
left ( matrix{
ccol{ {12 x} above 0 }
ccol{ 0 above 117 }
} right )