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  • Do you mean underline as the highlight as said in the title? (Well, it is easy to change its color just using \color{} within a {}.) Commented Apr 25, 2022 at 4:32
  • Will \color{} maintain the alignment so that all the equal signs are under each other? Commented Apr 25, 2022 at 4:45
  • Here the last line you can use \color{red} i^7 & \color{red}=-i and it looks right. (No {} needed in align environment.) Commented Apr 25, 2022 at 4:48
  • I tried your code and it gives me red text. I just want to highlight the the answer i^7 = -i. Commented Apr 25, 2022 at 4:56
  • SOmething like this works fine for me. \documentclass{article} \usepackage{xcolor} \usepackage{mathtools} % or \usepackage{amsmath} \begin{document} \begin{align*} %-- i^7 &= 1 \times i^3 \\[5mm] %-- i^7 &= i^3 \\[5mm] %-- i^7 &= i^2 \times i \\[5mm] %-- i^7 &= -1 \times i \\[5mm] %-- i^7 &= -i \\[5mm] %-- \color{red} i^7 & \color{red} =-i \end{align*} \end{document} Result: image Commented Apr 25, 2022 at 4:57