Here’s a great set of steps:
http://www.fosslinux.com/1387/how-to-install-microsoft-true-type-fonts-in-solus.htm
In essence it’s two interactive commands, first one, then the other:
sudo eopkg bi --ignore-safety https://raw.githubusercontent.com/solus-project/3rd-party/master/desktop/font/mscorefonts/pspec.xml
sudo eopkg it mscorefonts*.eopkg;sudo rm mscorefonts*.eopkg