$\"\"$

The sentence is “the product of 12 and the sum of a number and negative 3”.

The word “Sum” indicates addition “ $\"\"$ ”

The word “negative” indicates the symbol “ $\"\"$ ”

The word “product” indicates multiplication symbol “ $\"\"$ ”

Let n = number $\"\"$

Rewrite the sentence into expression as,

$\"\"$

The equation is $\"\"$ . $\"\"$

The algebraic equation is $\"\"$ .