Three party system : I will do everything party A+2 and party B+1
Unfortunately party A&B spent the last 4 decades destroying the education system so no one knows algebra anymore (including me so I might have done that wrong).
You're probably gonna hate this, but I think it actually matters how you add them up. Cuz think if you add 0 + 1 + 2 - 1 + 3 - 2 + 4... that pattern will always be positive. (And this is assuming we're only using integers)
Technically (not really) sum of all positive integers results in -1/12, which is due to the nature of infinite series and MATH I no longer understand. So it stands to reason, that if you add a -1 multiplier and sum results of both series together, you would get 0! Approximately.
I also can't remember the maths, but iirc the -1/12 value is based on a faulty assumption somewhere in the calculation (probably dividing by 0 at some point)