% \setupmathfences[state=auto]

\starttext

\startformula
    \left ( 1 - x \right ) =
    \left(1-x\right) =
    \left( 1-x\right) =
    \left(\relax 1-x\right) =
    \left\(1-x\right\) =
    \left\(1-x\right\)
\stopformula

\stoptext
