I have looked at other posts on retained earnings and I'm still a bit confused on my specific problem.

It says the business started january 1st, 2006.
it says for december 31, 2006

assets: 1,000
liabilities: 200
contributed capital: 300
retained earnings: X
revenue: 300
expenses: 100

then december 31 2007 it says:
assets: 2,500
liabilities: 1,000
contributed capital: 300
retained earnings: Y
revenue: 2,500
expenses: 1,500


I need to find X and Y. do I just do
assets = liabilities + contributed capital + RE
for the math to find RE?

thanks