Answer:
3n - 3
Step-by-step explanation:
3n-3
n-1(1-n)-1 = n- 1 + n - 1 = 2n-2
1 - (2n-2) = 1 - 2n + 2
n - (1 - 2n + 2) = n - 1 + 2n -2 which equals 3n - 3
