This is taken from a comment in one of Sauce's old high stakes videos, but I figure even mid-stakers can figure this out.

$10/20 blinds.
Hero opens KJo to $60.
BU raises to $165.
Blinds fold.

Sauce states:
"I ran a polarized range of $3b7.3, which goes AQs+, TT+, A5s-A9s, AJo, T9s-65s (around 50% bluffs). Against this we need to realize ~82.5% of our equity."

Can someone show me how to setup the equation such that we solve for R = 82.5% ?

Also, does anyone know where this "$3b7.3" comes from? I'm assuming it is an export from a range tool.