$$6P^{2}q-8pq+9Pq^{2}-10p+8q+6; 20-2p-8q+-3Pq+-1pq^{2}+3p^{2}q$$
$6-10p+6qp^{2}+9pz+qz-8py$
$-8y+9z+12pq-10$
