Once you have that, becoming rich is trivial. Multiplying both sides of the equation by one trillion, 1 trillion = 0. So open a bank account with $0, now you have one trillion. Easy.

A funnier (although grimmer) way: let p be the world's population. Multiplying both sides of the equation by (p-1) you get p-1=0. Thus, p=1. If you assume that you exist (which is a reasonable assumption, following Descartes's reasoning) you now own all the wealth in the world.