I believe there is no single solution that can move our nation toward energy independence.

Required: a single solution which would satisfy each of them.

He was able to build a battery with just a single solution.

The system must contain enough information for a single solution to be found.

"Now all we have to do is find a single solution, rather than two different ones."

There is no single solution that works for all situations.

So we don't believe that a single solution is going to address all the needs.

It therefore offers not a single solution to the problems in the industry.

I am more or less certain that we will not find an answer with one single solution.

The answer to the problem will not be a single solution but variety.