$\"\"$ $\"\"$

The equation is $\"\"$ .

Apply addition property of equality: Add 13 to each side.

$\"\"$

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

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

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

$\"\"$

Check:

To verify the solution, substitute $\"\"$ in $\"\"$ .

$\"\"$

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

$\"\"$

The value of $\"\"$ .