$\"\"$

The equation is $\"\"$ .

3 equals what number plus 12? (Write the equation as a question)

The question is D.

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.