The equation is .

Apply addition property of equality: Add 5 to each side.

                   (Apply additive inverse property: )

                         (Apply additive identity property: )

                               (Add: )

Check:

To check the solution, substitute in original equation.

10 = 10                            (Subtract: 15 – 5 = 10)

The statement is true.

To graph the solution on the number line:

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• Draw the number line.
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• Mark a dot at 15 on the number line.
\

The value of .