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\setupexternalfigures[location={local,global,default}] \defineexpandable\ColumnA ValueA {30mm20} \defineexpandable\ColumnB ValueB {40mm30} \defineexpandable\ColumnABii ValueC {\ctxlua{context([==[\ColumnA ValueA + \ColumnB]==]ValueB)}} ColumnABii: \the\dimexpr \ColumnABii\relax \externalfigure[cow][width=\dimexpr(\ColumnABii)\relax]ValueC
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\externalfigure ist also working without "\the".
== Other ways to calculate without dimension units ==
=== \ctxlua ===
=== Important to understand ===
