B2 I can understand extended speech and lectures and follow even complex lines of argument provided the topic is reasonably familiar.

Translate to French.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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B2 Je peux comprendre des conférences et des discours assez longs et même suivre une argumentation complexe si le sujet m’en est relativement familier.