$\"\"$

The equation is $\"\"$ .

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

Add 4 to each side.

$\"\"$

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

Multiply each side by 3.

$\"\"$

Cancel common terms.

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

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

$\"\"$

$\"\"$ .

This is true, therefore solution of the equation $\"\"$ is 15. $\"\"$

The solution is 15.