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Welcome to TeX.SE! PLease show us a code for equation (as part of complete small document beginning with \documentclass and ending with \end{document}.
– ZarkoJan 31 at 7:30
Maybe you transfer the formula to winedit, but not the preamble of the document?
– FranFeb 2 at 5:34
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\documentclassand ending with\end{document}. – Zarko Jan 31 at 7:30