I am having trouble with this proof.

A matrix B is similar to A if there exists a nonsingular matrix P such that

PAP^-1=B

The question is:

Prove if B is similar to A then A is similar to B

I have:

Assume B is similar to A. Then there exists P such that

PAP^-1=B.

multiplying both sides by P gives

PA=BP

then multiplying both sides by inverse of P gives

A=P^-1 *B*P

but I need to show A=PBP^-1. and I cannot figure it out. (Headbang) Thanks!!!!!!!