Emily's Bookstore Spending Challenge

Emily is at a local bookstore where she can buy books and stationery. Each book costs $12, and each packet of stationery costs $5. Emily has saved $68 to spend. If she buys twice as many books as packets of stationery, how many packets of stationery can she buy?

Let the number of packets of stationery be represented by $s$. Then the number of books will be $2s$. The total cost can be represented by the equation:

$$12(2s) + 5s = 68$$

Solve for $s$ to find the number of packets of stationery.