On factorising 14pq + 35pqr, we get:

pq(14+35r) p(14q+35qr) q(14p+35pr) 7pq(2+5r)

7pq(2+5r)

14pq + 35pqr = 2*7*p*q + 5*7*p*q*r = 7pq(2+5r)