Michael's Savings for a Video Game

Michael is saving up for a video game that costs $45. He has already saved $15. If he saves $5 each week, how many weeks will it take him to save enough money to buy the game?

Let $w$ represent the number of weeks Michael saves. The equation to find out how much money he will have after saving for $w$ weeks is:

$15 + 5w = 45$