Verified answer

it become this after simplifying

2*q^4/p^2+3*p^2*q*r^6+p*q^3*r^6

then you can factorize the like terms and it becomes

2*q^4/p^2+p*q*r^6*(3*p+q^2)

it can be factorized further into

q*(2*q^3/p^2+p*r^6*(3*p+q^2))

you can remove the fraction by multiplying the whole expression with p^2, which would give you

2*q^4+p^3*r^6*(3*p+q^2)

pq^3r^6 + 3p^2qr^6 + (2q^4/p^2)