$\"\"$ $\"\"$

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The equation is $\"\"$

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Addition property of equality: If $\"\"$ then $\"\"$ :

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Add 8 to both sides.

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$\"\"$

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$

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$\"\"$ (Divide each sides by 9)

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$\"\"$ (cancel common terms)

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (Multiply each sides by negative one)

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$\"\"$ (Product of two same signs is positive)

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$\"\"$

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Check:

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To check the solution, substitute $\"\"$ in original equation.

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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Compare the values, the equation is true. The solution is $\"\"$ .

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$\"\"$

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The value of $\"\"$ .