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

The equation is $\"\"$ .

$\"\"$ (Distribute 7)

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

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

Apply division property of equality: Divide each side by 2.

$\"\"$

$\"\"$ (Cancel common terms)

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

The value of $\"\"$ .