This is the 832nd most frequent Russian word.
решить
To decide or to solve.
Here, 'решил' means 'decided,' referring to making a choice or decision.
Я решил выучить новый язык.
I decided to learn a new language.
In this sentence, 'решили' translates to 'solved,' indicating resolving or finding a solution to a problem.
Мы решили проблему вместе.
We solved the problem together.
Here, 'решить' implies 'to solve,' meaning to find answers to given questions or problems.