5p/(4q+p)+20q/(4q-p)=
[5p(4q-p)+20q(4q+p)]/(4q-p)(4q+p)=
(20pq-5p²+80q²+20pq)/(4q-p)(4q+p)=
(80q²+40pq-5p²)/(16q²-p)=5(16q²+8pq-p²)/(4q-p)(4q+p)
5p/(4q+p)+20q/(4q-p)=
[5p(4q-p)+20q(4q+p)]/(4q-p)(4q+p)=
(20pq-5p²+80q²+20pq)/(4q-p)(4q+p)=
(80q²+40pq-5p²)/(16q²-p)=5(16q²+8pq-p²)/(4q-p)(4q+p)