The equality is

Apply subtraction property of equality: Subtract n from each side.

                   (Additive inverse property: )

                      (Additive identity property: )

                            (Sustract: )

                      (Divide each side by 2)

                           (Cancel common terms )

                               (Divide: )

Graph the solution set o n a number line.

Check:-

To check, substitute , in .

                  (Multiply: )

                        (Sustract: )

The equality solution is .