(3n)-2=5
Move all numbers without a variable to the right side of the equation
3n=7
Divide 7 by 3
n=2.333
It should be 9. I hope this helps. If it's not 9 then can u please give me a list of your answers to choose from.
Step-by-step explanation:

The answer would be A.132 because when you add the corner length to 90 it equals 132