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

The expression is $\"\"$ .

According to addition property of equality: Add 9 to each side.

$\"\"$

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

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

Check:

Check the solution by substituting $\"\"$ in the original equation.

$\"\"$

$\"\"$ (Subtract: – 2 – 9 = –11) $\"\"$

The value of $\"\"$ .