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OpenStudy (smrougraff):
Triangle ABC is congruent to triangle DEF. In triangle ABC, side AB measures 6, side BC measures 5x−21, and side CA measures 5. In triangle DEF, side DE measures 6, side EF measures x−1, and side FD measures 5. What equation would help you to solve for the side length of BC and EF? Explain your reasoning using complete sentences.
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