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

3�� + 3
9

There is no equivalent sum or difference to the expression 3n² + 3, it is already in its simplest form.

To find the sum or difference that is equivalent to the expression 3x + 3, we can rearrange the terms. The sum or difference can be written as:

3x + 3 = 3(x + 1)

Therefore, the equivalent sum or difference is 3(x + 1).