Answer:
N-12 = 20
N=32
Step-by-step explanation:
Difference means subtract, is means equals
N-12 = 20
Add 12 to each side
N-12+12 =20+12
N = 32

That should be the final answer. If you need help with the distribution process I can explain that separately if needed. If not, hope this helps!
Answer/Step-by-step explanation:
Given:
< 
To solve, collect like terms.
Subtract 5w from both sides
< 
< 
<
(incorrect)
The inequality given has no solution or an information is missing.
AB = AC
18 = 3x + 6
-6 -6
18-6 = 3x
12/3 = 3x/3
4 = x