There isn't any solution. ✬

Have you found any good solution? ✬

I can't think of any solution to this problem. ✬

I finally found the solution to the problem. ✬

Surgery is the best solution. ✬

Nobody was able to suggest a solution. ✬

He thought of a good solution. ✬

A fault common to scientists is mistakenly believing that every problem has a technical solution. ✬

The solution was quite simple. ✬

Do you have a solution? ✬