If Prejudice + Power = Racism, then solving for Prejudice, = Racism - Power? Racism - Prejudice = Power?

It started with a "Blacks can't be racist"/"Privilege + Power = Racism" conversation somewhere on some forum in the past year. I found out the redefinition of racism was from the 1970s, and is credited to Pat Bidol as the mint from whom that idea was coined. Since it's stated in math terms, one ought to be able to rearrange it and it still make sense. It clearly doesn't. That definition of racism is simplistic, at best. I think it's totally barking up the wrong tree, but if it's going to be the working definition for the left it really ought to be further fleshed out. 

If expressed as a function, maybe it would work better; it would still be wrong, but it might look rational. If you say "Racism is a function of Prejudice and Power," then you don't have to be able to "solve for _" but instead can just graph it..."measure" it. The problem here is that the theory suggests that POWER is a finite quantity in the relationship. I'm not clear whether the idea is that POWER is constant, or that it may fluctuate in total but that an instantaneous distribution may be knowable. It really is a convoluted definition, the "P + P = R" thing, whether one of the Ps is Prejudice or Privilege.

Anyway, just tossing out a topic.