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

The equation is $\"\"$ .

According to subtraction property of equality: Subtract 11 from each side.

$\"\"$

$\"\"$ (Apply commutative property of addition: $\"\"$ )

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

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

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

$\"\"$

CHECK:

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

$\"\"$

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

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

$\"\"$

The value of $\"\"$ .