You want to do to one side the same thing you do to the other side.
In order to get the n by itself you divide the 25n by 25. But in order to not change the answer you need to do the same to the 70.

so n=

which can be reduced to

so n=
The answer would be 16
11 + (8-3)^2 - 20 = 16
Answer:
-3/2 < x < 5......................