Dear Aditya, Thank you for your nice solution.

\startformula \startalign[n=1] \NC equation 1 \NR \NC equation 2 \NR \NC \startmatrix[left={\left.}, right={\right\}}, n=1, align=middle] \NC equation 3 \NR \NC equation 4 \NR \NC equation 5 \NR \stopmatrix some text here \NR \NC equation 6 \NR \stopalign \stopformula

It works nicely. I erase \NR after equation 5 because it makes another blank line below eq 5.

Math support will be reworked at some stage in MkIV.

Since I am not using a complicate equations, math support in ConTeXt is OK. And your mathalign is very helpful to me. Best regards, Dalyoung