Welcome to Kendall, Cantabrigia,
aka Kendall Square, Cambridge!
"The most innovative square mile
on the planet"
(The posted coordinates are fake, however you may find
a "Welcome to Cantabrigia" sign here.)
First, finish all five (5) stages of the "Public Ahts of Kendall, Cantabrigia" Adventure Lab (https://labs.geocaching.com/goto/8f0fb2ab-c107-4b7e-9176-80f2f93e3289), retreive all the information, and then solve the following puzzle to get the final coordinates to this Bonus Cache.
A x (A x A x A x A x B - C) = N 4 2 ° _ _ . _ _ _
C x D x D x D x D x (A x C x D - E) = W 7 1 ° 0 _ . _ _ _
Good Luck & Cache On! 
No Spoilers for the final location and container, PLEASE!
From "Public Ahts of Kendall, Cantabrigia" Adventure Lab descriptions:
Welcome to Kendall, Cantabrigia, aka Kendall Square, Cambridge! 
Let's take a mini-tour around the Kendall Square neighborhood, "the most innovative square mile on the planet", and visit a few of its many Public Ahts along the way! 
All five (5) stages of this Adventure Lab, and the associated GCB73ER Public Ahts of Kendall, Cantabrigia (https://coord.info/GCB73ER) are accessible, available 24/7, and are free to visit. Each of the five (5) locations, once answered correctly, will give you information to find the GCB73ER Public Ahts of Kendall, Cantabrigia (https://coord.info/GCB73ER).
The posted coords will take you to possible on-street metered pahking. There is quite a bit of on-street metered pahking all around Kendall Square, and Resident Pahking is free on Sundays as well. All five (5) stages can be visited in any order, yet the Bonus Cache would be hidden somewhere near this mini-tour. Approximately 1.3 mile / 2 kilometers round trip on foot, excluding the distance to the Bonus Cache. 
Enjoy!!! 
FTF: kernow