mfrac-10.test

<<< native
[ EFraction
    NormalFrac
    (ENumber "4")
    (EGrouped
       [ ENumber "2"
       , ESymbol Bin "+"
       , EFraction
           NormalFrac
           (ENumber "3")
           (EGrouped
              [ ENumber "1"
              , ESymbol Bin "+"
              , EFraction NormalFrac (ENumber "1") (ENumber "2")
              ])
       ])
, ESymbol Rel "="
, EFraction
    NormalFrac
    (EGrouped
       [ ENumber "1"
       , ESymbol Bin "+"
       , EFraction
           NormalFrac
           (ENumber "9")
           (EGrouped
              [ ENumber "2"
              , ESymbol Bin "+"
              , EFraction NormalFrac (ENumber "1") (ENumber "4")
              ])
       ])
    (ENumber "5")
]
>>> eqn
4 over {2 + 3 over {1 + 1 over 2}} = {1 + 9 over {2 + 1 over 4}} over 5