
Solve the EQUATION.
The Big Bang Theory Season 1, Episode 13

Now, when I get to this EQUATION here,
really let me have it.
The Big Bang Theory Season 10, Episode 19

An EQUATION.
The Big Bang Theory Season 11, Episode 14

in the same EQUATION.
The Big Bang Theory Season 10, Episode 15

Oh. Really?
Are you familiar with the Drake EQUATION?
The Big Bang Theory Season 2, Episode 20