$\"\"$

The equation is $\"\"$ .

$\"\"$ (Divide each side by 7)

$\"\"$ (Cancel common terms)

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

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

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

Check:

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

$\"\"$

$\"\"$ (Product two different signs is negative)

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

The statement is true. $\"\"$

The value of $\"\"$ .