rolling out Tuple List into a single List

Hi, list

I want to pass some equations to solve() function; Eq. have been generated by two indices in a loop:

[ eval(f, [x=i, y=j]) = 0 for i in 0..2  ] for j in 0..2

The result is a Tuple List and it cannot be passed to solve(). So, how it is possible to roll out Tuple of Lists into a single List? Or there is method of making equations by two indices directly into a single list?

Thanks.