$\"\"$

The expression is $\"\"$

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

$\"\"$

Apply the order of operations (PEMDAS) .

Since there are no parentheses, powers. First operation is addition.

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

Next operation is subtraction.

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

The value of the expression is $\"\"$ .