optimal solution

difficult / hard, probably impossible

to discover, to find (e.g. an error in a book) / to find (e.g. something missing)

to discover, to find (e.g. an error in a book); to find (e.g. something missing)

Alternative form of 見付ける

optimal, most appropriate, best suited

the best, the optimum

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

solution, untie

divide; split; separate / untie; loosen; relax; remove / make clear; explain / understand; comprehend / opinion; explanation; solution