factor 72p+8+9qp+q
⚠ qp is read as the product q*p because q and p appear separately
The expression: 72p + 8 + 9qp + q contains several variables so we pick p for factoring
Let's factorize in ℝ: 72p + 8 + 9qp + q
This expression can be factorized into: 9p·(8 + q) + (8 + q)
The common factor (q + 8) appears, allowing us to factor again
▶Factored expression:   (q + 8)·(9p + 1)