Make sure that whatever you do to one side you also do to the other. It's also important to remember the distributive property: a(b + c) = a*b + a*c.
Also, the aim here is to isolate n.
-3*(1 - 2n) = 63
-3(1) - (-3)(2n) = 63 | Distributed the -3 through the parentheses
-3 + 6n = 63
-3 + 6n + 3 = 63 + 3 | Added 3 to both sides
6n = 66
6n /6 = 66 /6 | Divided both sides by 6
n = 11
Hope this helps! :)
