$\"\"$

Julio buys a used car for $\"\"$ .

Monthly expenses for the car-which include insurance, maintenance, and gas-total $\"\"$ per month. Find the total cost of buying and owning the car for $\"\"$ months.

Let $\"\"$ be the total cost of buying and owning the car.

Consider the $\"\"$ and $\"\"$ .

$\"\"$ (Original equation)

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

$\"\"$ (Simplify)

$\"\"$

The equation is $\"\"$ .