A lawn care company charges a base fee plus an hourly fee to mow lawns.

For small lawns, the company charges $15.95 plus $23 per hour. The total charge S (in dollars) to mow a small lawn for H hours is given by the function S = 23H + 15.95.

For large lawns, the company charges $20.35 plus $28 per hour. The total charge L (in dollars) to mow a large lawn for H hours is given by the function L = 28H + 20.35.

Let F represent the difference between the charge for large lawns and the charge for small lawns. Which equation best represents this scenario?