\starttext \showframe

\setupformulas[align=flushleft]

\startformula
    \startalign[m=2,align={middle}]
        \NC \text to 6cm{} \NC x = 0 \NR
    \stopalign
\stopformula

\startformula
    \startalign[m=2,align={middle}]
        \NC \text to 6cm{One\hfill}           \NC a = 1 \NR
        \NC \text to 6cm{One Two\hfill}       \NC b = 2 \NR
        \NC \text to 6cm{One Two Three\hfill} \NC c = 3 \NR
    \stopalign
\stopformula

\startformula
    \startalign[m=2,align={left}]
        \NC \text to 6cm{One\hfill}           \NC a = 1 \NR
        \NC \text to 6cm{One Two\hfill}       \NC b = 2 \NR
        \NC \text to 6cm{One Two Three\hfill} \NC c = 3 \NR
    \stopalign
\stopformula

\blank[3*big]

\startformula
    \startalign[m=2,align={middle}]
        \NC \text to 6cm{} \NC x = 0 \NR
    \stopalign
\stopformula

\startformula
    \startalign[m=2,align={middle}]
        \NC \text to 6cm{One}           \NC a = 1 \NR
        \NC \text to 6cm{One Two}       \NC b = 2 \NR
        \NC \text to 6cm{One Two Three} \NC c = 3 \NR
    \stopalign
\stopformula

\startformula
    \startalign[m=2,align={left}]
        \NC \text to 6cm{One}           \NC a = 1 \NR
        \NC \text to 6cm{One Two}       \NC b = 2 \NR
        \NC \text to 6cm{One Two Three} \NC c = 3 \NR
    \stopalign
\stopformula

\blank[3*big]

\startformula
    \startalign[m   =2,align={middle}]
        \NC \text{} \NC x = 0 \NR
    \stopalign
\stopformula

\startformula
    \startalign[m=2,align={middle}]
        \NC \text{One}           \NC a = 1 \NR
        \NC \text{One Two}       \NC b = 2 \NR
        \NC \text{One Two Three} \NC c = 3 \NR
    \stopalign
\stopformula

\startformula
    \startalign[m=2,align={left}]
        \NC \text{One}           \NC a = 1 \NR
        \NC \text{One Two}       \NC b = 2 \NR
        \NC \text{One Two Three} \NC c = 3 \NR
    \stopalign
\stopformula

\stoptext
