Question

Help me with this !!!!

Answer 1

1) 4n - 4 + 4n = -4 + 8n
-4 = -4 + 8n
8n = 0
n = 0
2) -2 +6 = -4 -2a
4 = -4 -2a
-2a = 8
a = -4
3) -7 + x = 2x - 12
-x = -5
x = 5

Answer 2

I kinda understand it but I don't really know sorry

Explanation: