<<< native [ EIdentifier "x" , ESymbol Rel "=" , EFraction NormalFrac (EGrouped [ ESymbol Bin "\8722" , EIdentifier "b" , ESymbol Bin "\177" , ESqrt (EGrouped [ ESuper (EIdentifier "b") (ENumber "2") , ESymbol Bin "\8722" , ENumber "4" , EIdentifier "a" , EIdentifier "c" ]) ]) (EGrouped [ ENumber "2" , EIdentifier "a" ]) ] >>> mml

x = \frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}