$\"\"$

The equality is $\"\"$ .

Apply addition property of equality: $\"\"$ .

$\"\"$ (Add 10 to each side)

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

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

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

Check:

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

$\"\"$ (Write the equation)

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

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

The equality is true. $\"\"$

The solution is $\"\"$ .