Eileen, let's do a problem the "wrong" way as an example. Let's say we had 5 (2 + 5). Normally, we would solve that as 5(7) and get 35. However, we can also do 5(2) + 5(5) = 10 +25 = 35.
I'll give you an example like your problem and see if you can relate.
5(6x + 6) = 90.
So, 5(6x) + 5(6) = 90
30x + 30 = 90
30x = 60
x = 2.
Does this help?
