The equation is  .

Apply subtraction property of equality: Subtract 90 from each side.

                  (Apply additive inverse property: )

                        (Apply additive identity property: )

                             (Subtract:    )

Check:

To check the solution, substitute  in original equation.

                              (Add: )

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 on  the number line.
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The value of .