$\"\"$

The equation is $\"\"$ .

Apply distributive property: $\"\"$ .

$\"\"$

Apply division property of equality: $\"\"$ then $\"\"$ .

Divide each side by 7.

$\"\"$

Cancel common terms.

$\"\"$ . $\"\"$

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

$\"\"$

The product of two opposite signs is negative and the product of two same signs is positive.

$\"\"$

$\"\"$ .

This is true, therefore solution of the equation $\"\"$ is $\"\"$ . $\"\"$

The solution is $\"\"$ .