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

The equation is $\"\"$ .

According to divisionion property of equality: Divide each side by $\"\"$ .

$\"\"$

$\"\"$ (Cancel common terms) $\"\"$

According to subtraction property of equality: Subtract $\"\"$ from each side.

$\"\"$

$\"\"$ (Apply commutative property of addition: $\"\"$ )

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

$\"\"$ (Apply additive identity property: $\"\"$ )

$\"\"$ (Simplify) $\"\"$

The value of $\"\"$ .