\starttext
\setupformulas[align=right]

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ℕ ≔ \left\{0; 1; 2; 3; … \right\}
\stopformula

\setupmathematics[autopunctuation=no]
\startformula
ℕ ≔ \left\{0; 1; 2; 3; … \right\}
\stopformula
\stoptext
