The equation is 

             (Subtract 23 from each side)

                         (Apply Additive inverse property: 23 23= 0)

                                (Subtract:    )

Check:

To check the solution, substitute  in original equation.

                               (Add: 23-9=14)

The statement is true.

 Graph the solution on number line.

\
• First draw a number line.
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• Mark a dot at -9 on  the number line.
\

The value of .