Answer:
2 n - 4
Step-by-step explanation:
Subtract the numbers
Combine like terms
2n-4
1. Take away parenthesis, rewrite
n+8+n-12
2. Subtract like terms, rewrite
8-12 = -4 ; n-4+n
3. Combine like terms, rewrite
n+n=2n ; 2n-4
