(I take it you mean particles, not universes)
Plus (matter) and minus (antimatter)
Mostly canceled each other out, although
Some of each went free; however, by chance,
Black holes destroyed more antimatter
Than matter, leaving a slight excess of
Matter with which to form the universe.
or
Antimatter exists as dark matter.
or
The pluses formed matter, energy,
While the minuses formed gravity.
or
?