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I write my own stylesheet. I use GridBox and GridBoxOption to edit the environment of EquationNumbered, in which, I set 

Cell[StyleData["EquationNumbered"], TextAlignment->Center, FontSize->14, GridBoxOptions->{AllowScriptLevelChange->False, GridBoxAlignment->{ "Columns" -> {{"\[AlignmentMarker]"}}, "Rows" -> {{"\[AlignmentMarker]"}}}}]

Now, when I choose the style of EquationNumbered, the multi-line formula will align to the alignmentmarker that I set.
But,when I do not set the alignmentmarker, they will aligned to the right instead of the center as usual. How can I fix this problem.
Without AlignmentMarker

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  • $\begingroup$ Want to know the solution too. But I suspect it's just not possible... (Or maybe there is a undocumented usage to specify the priorities of alignments?) $\endgroup$ Commented Nov 22, 2014 at 9:15

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Extended comment.

1 You need to show the Grid/Matrix so we can see what you are trying to do.

2 If you want to align to the right you do not need to use alignment markers (hence point #1).

3 There is this example in the docs:

Grid[{{1.234, 12.34}, {123.4, 1234.}, {1234, 1.234}},Alignment -> "."]

where you would obviously replace "." with alignment marker

4 An alternative to programmatic generation of alignments is simply to create your grid/matrix and insert alignment markers Esc am Esc, then Format > Text Alignment > On Alignment Marker. e.g

Cell[TextData[Cell[BoxData[{ FormBox[ RowBox[{"x", "=", "\[AlignmentMarker]", "y"}], TraditionalForm], "\[IndentingNewLine]", FormBox[ RowBox[{ RowBox[{"x", "+", "7"}], "=", "\[AlignmentMarker]", RowBox[{"z", "-", "1234567"}]}], TraditionalForm]}], TextAlignment->AlignmentMarker, FormatType->"TraditionalForm"]], "Text"]

enter image description here

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  • $\begingroup$ Thanks. I know everything you suggest. But my problem is that how can set the GridBoxAlignment in GridBoxOptions so that the grid elements shall align to the center when I do not set any alignmentmarker while align to the marker when I set it explicitly. Thank you. $\endgroup$ Commented Nov 21, 2014 at 6:28
  • $\begingroup$ I'm searching for answer to the same thing. @AchillesJJ $\endgroup$ Commented Sep 26, 2015 at 11:13
  • $\begingroup$ A workaround is to set the stylesheet to center and then create a shortcut to override it at the cell level using a shortcut key. This can be done with celleventactions. $\endgroup$ Commented Apr 4, 2022 at 17:43

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