. Write the sum or difference that is equivalent to the following expression?

3�� + 3
9

The sum that is equivalent to the expression 3�� + 3 is 9.

To find the sum or difference that is equivalent to the expression 3× + 3, we can simplify it by performing the multiplication.

3× is equivalent to 9, so the expression can be rewritten as:

9 + 3

Now, we can simply add 9 and 3 to find the final result:

9 + 3 = 12