Install equalx by entering the following commands in the terminal:
sudo apt update sudo apt install equalx
Description:
graphical editor for LaTeX equations
EqualX is a graphical interface to LaTeX and a bunch of conversion programs for aiding you write equations faster in LaTeX and export them to other applications.
Homepage: http://equalx.sourceforge.net/index.html
Version: 0.7.1-4build1
Section: universe/tex