The equation is 

             (Subtract 5 from each side)

                          (Apply Additive inverse property: 5 5 = 0)

                                 (Subtract:    )

Check:

To check the solution, substitute  in original equation.

                               (Add: 13 + 5 = 18)

The statement is true.

 Graph the solution on number line.

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• First draw a number line.
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• Mark a dot at 13 on  the number line.
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The value of x = 13