Question

What is 20p-2p+4p=20p-6p

Answer 1

You can't do that because if you combine like terms on both sides, you would get 22p=14p, and you can't do anything with that, unless you're trying to factor it, in which case you do 22p-14p=0.

Answer 2

That's a linear equation. Its solution is [ p = 0 ].