2390423824273575973297297n + 45

The answer is 2390423824273575973297297n + 45

Step-by-step explanation:

It's in its simplest form.

11 - 7x, x + 3

Step-by-step explanation:

I would assume the "x" is a times symbol. If not, I have another answer below.

Anyway, we would have:

8 - 7x + 3 =

11 - 7x

Thus 11 - 7x would be our answer if the "x" means multiplication.

Otherwise:

8x - 7x + 3

x +3

Therefore x + 3 would be our answer is "x" is a variable not multiplacation symbol.