$\"\"$

The expression is $\"\"$ .

Subtraction property of equality:

If x + a = b, then x + a – a = b – a, or x = b – a.

$\"\"$ (Subtract – 2.2 from each side)

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

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

$\"\"$

Check:

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

$\"\"$

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

$\"\"$

The value of $\"\"$ .