The word resolvisteis is the preterite form of resolver in the second person plural.
See the full resolver conjugation
Emily y tú resolvisteis casos juntas y vivieron asombrosas aventuras.
You and Emily solved cases together, and you went on amazing adventures.
Quizás esté diciendo, "resolvisteis esto la primera vez, pero no lo resolveréis una segunda."
Perhaps he's saying, "you solved this the first time, but you won't solve it a second time."
No sé si estar asustada o emocionada por cómo resolvisteis eso!
Oh, I don't know whether to be terrified or excited at how well you guys just pulled that off!
Durante el proceso de venta, resolvisteis nuestras dudas y las de los compradores sin ningún problema.
During the process nothing was too much trouble for you in both dealing with our queries and the purchasers.
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