Dear Sylvain, I am using ’\startalign’

\starttext \startformula \eqalign{ ax^2+bx+c &= 0 \cr x &= \frac{-b \pm \sqrt{b^2-4ac}}{2a} \cr } \stopformula \stoptext

\starttext \startformula \startalign \NC ax^2 + bx + c \NC = 0 \NR \NC x \NC = = \frac{-b \pm \sqrt{b^2-4ac}}{2a} \NR \stopalign \stopformula \stoptext There is a nice guide book "My Way” for math-alignment by Aditya. https://wiki.contextgarden.net/images/archive/b/b4/20100530075041!Mathalign.... https://wiki.contextgarden.net/images/archive/b/b4/20100530075041!Mathalign.... Best regards, Dalyoung