The equation is  .

Apply subtraction property of equality: Subtract 7 from each side.

                          (Apply additive inverse property: 7 7= 0)

                                (Apply additive identity property: )

                                      (Subtract:  )

Check:

To check the solution, substitute  in original equation.

                                   (Add: 7 + 14 = 21)

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 14 on  the number line.
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The value of .