solve each equation and verify the results

Question

5(a-3)=20

-2(n+3)=-10

7=4(2+y)

-2(n+3)=-6

Answer 1

These are fundamental easy equations.
You absolutely MUST know how to do these

I will do the 2nd one:
-2(n+3)=-10
-2n - 6 = -10 , I expanded
-2n = -4 , I added 6 to both sides
n = 2 , I divided both sides by -2

Answer 2

No actually, we just learnt these and I 've been having trouble gripping how to do them! sorry. I just needed help understanding the steps on how to do it. So no I actually don't know how to do them yet and was trying to get a better idea on the procedure needed to solve these.
But thank you anyways I think I get it now!!

Answer 3

1. 5(a-3) = 20.
Divide both sides by 5:
a-3 = 4
Add 3 to both sides:
a = 7.