Question

Calcule o valor numerico des expressões algebricas 
- 2n-(n-8)+1

Answer 1

- 2n-(n-8)+1
-2n -n +8 +1=0
-3n +9 = 0
-3n = -9.(-1)
3n = 9
n= 9/3
n= 3 

Answer 2

-2n-(n-8)+1
-2n-n+8+1=0
-2n-n=-1-8
-3n=-9
n=-9/-3(-1)
n=9/3
n=3