Help please it's word problems

Question

 Pranav was going to sell all of his stamp collection to buy a video game. After selling half of them he changed his mind. He hen bought even seven more. How many did he start with if he now has 30?

 

 

please help the answer is 46 but I don't know how to solve it

Answer 1

s represents the number of stamps to begin

0.5s represents the number of stamps after the sale

 

0.5s + 7 = 30

 

Can you solve for s?