$\"\"$

The expression is $\"\"$

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

$\"\"$

Apply the order of operations (PEDMAS).

Since there are no parenthesis, powers, first operation is addition.

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

Next operation is subtraction.

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

$\"\"$

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