Its because the power of zero is undefined
Step by step I’m not sure sorry dog
I don’t understand the links? Like is that trolling????
You want to isolate C, so the first step would to have it be positive. You would do this by adding C to both sides of the equation to cancel the C on one of the sides out like this:

. Then you want to cancel out the P, so you subtract it on both sides like this:

And that is your answer