I need help on algebra I'm really confused on this question

Question

An Internet company chooses to advertise with banners on websites visited by a target customer group. The web advertiser offers two plans with the same final cost. The first plan offers 3,000 banner ads for x dollars each plus a set-up fee of $50. The second plan offers 2,000 banner ads for x dollars each plus a set-up fee of $100. What is the cost per banner for each of these plans? 

This is the full problem I'm just confused on what to do, please help thanks :)

Answer 1

first final cost = 2nd final cost where x= cost per banner

50+3000x = 100+ 2000x

3000x-2000x = 100-50

1000x = 50

x = 50/1000 = 5/100 = $0.05 = 5 cents per banner