The inequality is .

(Apply addition property of inequality:

For any real number, a, b, and c: If a > b then a + c > b + c)

        (Add 13 to each side) \ \

(Apply division property of inequality:

For any real numbers, a, b, and c: if a b then )

                             (Divide each side by 4)

  (Multiply each side by negative one and flip the symbol)

                      (Product of two same signs is positive)

The graph of the solution set on a number line diagram.

Note: A circle means that this point is not included in the solution set.

The solution set of the inequality is .