The inequality is .

Apply substration property of inequality: Subtract 12 from each side.

    (Apply commutative property of addition: )

              (Apply additive inverse property: )

                    (Apply additive identity property: )

                        (Subtract: )

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 in

                    (Substitute )

                            (Subtract: )

The inequality is true.

The inequality solution is .