What equation would you use to solve this problem?

Ed Sheeran currently has 150 dollars and is spending $3 per day. Lady Gaga has no money but is earning $5 each day. After how many days will they have the same amount of money?

a. 3x = 5x - 130
b. 5x = 150 - 3x
c. 3x = 150 - 5x