Javian has a gift card with a $150 balance. He buys several video games that cost $35 each. After the purchases, his gift card balance is $45. Which equation describes how many video games he bought?
a. 45+35x=150
b. 150-45=35x
c. 150=35x=45
d. 150-35x=45
PLEASEEEEEEE HELP!!!!!!!!!!!!!!!