Search for highest common denominator and factor

9r + 24t in this case 3......(9r + 24tz)/3 = 3(3r +8z)

4w + 12 - zw - 3z combine terms to divide by HCD

(4w-zw)/w + (12-3z)/3 =

w(4-z) + 4(3-z)

The trick is looking for like terms and reducing by the hCD