Well, we can simplify by combining like terms.
We can combine everything with an X. Like 4x and -6x
Don't forget to keep the signs in mind!
4x-6x = -2x
-2x-5x = -7x
Now we are done with X's and on to normal numbers
12-20 = -8
So, we can say that it is also equal to -7x-8
Hope that helps!!