You decide to order some baseball cards from an online catalogue. Each pack of cards you order costs $3.50, and the shipping fee is a flat $5.00 no matter how many cards you order. If your order came to a total of $50.50, how many packs of cards did you order?

packs

Construct the equation 3.50x + 5=50.50, where x is the number of packs you ordered from the store.

3.50x + 5=50.50

3.5x=45.5

x=13