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で解決

solve by

→ で
phrase Uncommon #18,146
solve by 解決 means “solve” or “resolve”; で marks the means or method. The exact translation depends on the words before it.
JA: この問題は話し合いで解決できます。
EN: We can resolve this problem through discussion.

物事を理屈だけで解決することはほとんどできない。

You can rarely solve things through logic alone.

その問題は僕自身で解決しなきゃいけないんだ。

I have to solve that problem myself.