The equation is

       (Add 6 to each side)

                   (Apply Additive inverse property: )

                          (Add:   )

Check:

To check the solution, substitute    in original equation.

                               (Subtract: )

The statement is true.

          to graph the solution on the number line;

\
•        draw the number line
\
•       mark a dot at 19 on the number line
\

The value of     .