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

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

[ebuild  N     ] dev-libs/mathjax-2.7.7-r1::gentoo  USE="-doc -examples" 24754 KiB

Total: 1 package (1 new), Size of downloads: 24754 KiB