$\"\"$

The equation is $\"\"$ .

$\"\"$ (Write the equation)

$\"\"$ (Subtract 12 from each side)

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

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

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

The solution is $\"\"$ . $\"\"$

Check whether $\"\"$ is a solution.

$\"\"$ (Write the equation)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Add: $\"\"$ )

$\"\"$ is the solution of the equation. $\"\"$

$\"\"$ is the solution of the equation.