These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] media-fonts/jsmath-1.0::gentoo  USE="X" 125 KiB
[ebuild  N     ] media-fonts/jsmath-extra-dark-1.0::gentoo  USE="X" 237 KiB

Total: 2 packages (2 new), Size of downloads: 362 KiB