$\"\"$

The equation is $\"\"$ .

9 + what number equals to 17? (Write the equation as a question)

The solution is 8. $\"\"$

Check whether 8 is a solution.

$\"\"$ (Write the equation)

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

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

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

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