$\"\"$

The expression is $\"\"$

$\"\"$ (Add 3 to each side.)

$\"\"$ (Apply Additive inverse proparty: $\"\"$ )

$\"\"$ (Apply Additive identity proparty: $\"\"$ )

$\"\"$ (Multiply each side by ancel c2)

$\"\"$ (Cancel common terms)

$\"\"$ (multiply: $\"\"$ )

$\"\"$

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Check:

Substitute 6 for x in original equation.

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$\"\"$

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

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

Compare the values the equation is true.

$\"\"$

The value of $\"\"$ .