4)) Solve for .

To solve for in the equation , you need to isolate . Start by dividing both sides by 2:

Calculating that gives you:

So, equals 15!

Now, let’s consider this in a real-world context: If you think of as the number of items in a purchase where each item costs $2, then spending $30 means you bought 15 items. Isn’t it neat how algebra helps us with daily calculations?

Also, a common mistake people might make with such equations is forgetting to divide both sides by the same number. Always remember, to maintain the balance, whatever you do to one side, you must do to the other! It’s like keeping a scale upright; each side must match!