Negative negative negative negative negative negative 1 is equal to 1.

Mac array + Na = Macarena.

This puzzle was inspired by 'Pink Panther theme song played with marker'. My disappointment was immeasurable and my day was ruined when the equation in that video didn't mean anything.

Two stealth jokes you might have missed: the equations for Friday and Shake It Off are, for different reasons, appropriate to the songs.

Fun fact: one team got so angry at the Mac Array Na and Mega-Loaf Veiny Uh puns that they messaged my roommate and got them to buy a bag of marshmallows and throw them at me.