The inequality is .

The first inequality is

Apply substration property of inequality: substrate each side by5 .

       (Commutative property: a + b = b + a) \ \

                (Additive inverse property: 5 - 5=0)

                       (Substract: 8 - 5 = 3)

                  (Divide each side by 3)

                          (Cancel common terms)

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

                         (Proudct of two same sign is positive)

The second inequality is

Apply substration property of inequality: substrate each side by5 .

                          (additive inverse property ;5-5=0)

                                    (add;-13-5=-18)

                             (divide each side by 3)

                                              (cancel common terms)

                              (proudct of same sign positive)

Graph the solution set on a number line.

The inequality solution set is .