<<< native
[ ESqrt
    (EGrouped [ EIdentifier "x" , ESymbol Bin "-" , ENumber "3" ])
, ESymbol Bin "+"
, ESqrt (EGrouped [ ENumber "3" , EIdentifier "x" ])
, ESymbol Bin "+"
, ESqrt
    (EFraction
       NormalFrac
       (ESqrt (EGrouped [ ENumber "3" , EIdentifier "x" ]))
       (EGrouped [ EIdentifier "x" , ESymbol Bin "-" , ENumber "3" ]))
]
>>> eqn
sqrt {x - 3} + sqrt {3 x} + sqrt {{sqrt {3 x}} over {x - 3}}