The inequality is .

Apply to addition property of equality: Add 30 to each side.

                   (Additive inverse property:  )

                        (Additive identity property:  )

                                    (Add:  )

Graph the solution set on a number line.

Note: A dot means that this point is included in the solution set.

Check:

To check, substitute a number less than or equal to 7 in .

                           (Substitute  )

                             (Subtract: )

The inequality is true. \ \

The solution set is .