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horizontal alignment - How to place and number 3 short equations in one line? - TeX - LaTeX Stack Exchange
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vertical alignment - How to get only one vertically centered equation number in align environment with two equations - TeX - LaTeX Stack Exchange
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math mode - Aligning multiple lines in long equations and arranging the line breaks in `\align` environment - TeX - LaTeX Stack Exchange
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luatex - braced equation with multiple lines on right side, with equation numbers - TeX - LaTeX Stack Exchange
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