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The page-break-inside avoid is ignored by a lot of readers, so it is a bit hit and miss. The reason is the internal HTML tag which is required for the subscript.
white-space: nowrap is also not supported by a lot of readers...
There is no real solution for this. What you might try is creating an SVG with the formula and insert that as image. You can use text in SVG and all readers must support that according to the specifications.
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