$\"\"$

The expression is $\"\"$

$\"\"$ (Replace x with 7 and y with 3 in original expression)

$\"\"$

By the order of operations (PEMDAS):

Since there are no grouping symbols and powers,

First operation is multiplication.

$\"\"$ (Multiply: $\"\"$ )

$\"\"$

Next operation is subtraction.

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

$\"\"$

The value of the expression is 15.