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

The expression is $\"\"$ .

Apply Subtraction property of equality: Subtract 4 from each side.

$\"\"$

Apply commutative property of addition: a + b = b + a.

$\"\"$

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

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

$\"\"$ (Multiply each side by negative one)

$\"\"$ (Product of two same signs is positive) $\"\"$

The value of n is 4.