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

The equation is $\"\"$ .

Apply subtraction property of equality: Ifa=b then $\"\"$ . \ \

$\"\"$ (Subtract 13 from each side)

$\"\"$ (Additive inverse property: $\"\"$ ) \ \

$\"\"$ (Additive identity property: $\"\"$ )

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

$\"\"$

Check:

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

$\"\"$

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

Compare the values, the equation is true. The solution is $\"\"$ .

$\"\"$

The solution is $\"\"$ .