A company that replicates DVDs spends  per day in building overhead plus per DVD in supplies and labor.

If the DVDs sell for per disk.

Find how many DVDs must the company sell each day before it makes a profit.

Let be the number of DVDs.

                               (Original equation)

  (Subtract  from each side)

                                           (Apply additive inverse property: )

                                        (Divide each side by )

                                                  (Cancel common terms)

Therefore,the company must sell more than DVDs per day to make a profit.

The company must sell more than DVDs per day to make a profit.