A video rental company offers a plan that includes a membership fee of $6 and charges $2 for every DVD borrowed. They also offer a second plan, that costs $48 per month for unlimited DVD rentals. If a customer borrows enough DVDs in a month, the two plans cost the same amount. What is that total cost of either plan? How many DVDs is that?

Answer 1

6+2x = 48
Looks like 21 DVDs.
Naturally, the total cost would be $48, since the 2nd plan always costs that.