The inequality is .

(Apply multiplication property of inequality:

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

    (Multiply 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 dot means that this point is included in the solution set.

The solution set of the inequality is .