So if you really want to see the most complicated equation ever, call in sick for a few weeks. A better question might be “what is the most (but not needlessly) complicated equation?”. Evidently, if you want an equation that genuinely needs to be complicated, you don’t need a complicated situation, you need complicated dynamics. So what’s the most (but not needlessly) complicated equation in the universe? Each different variable (x 1 =x, x 2 =y, x 3 =z) tells you something different.