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- 冷眼旁觀Lv 72 months agoFavorite Answer
2A + B → C + D

C ⇌ 2E

Sum up the two elementary steps, we get

2A + B + C → 2E + C + D

Cancel C on each side, we get

2A + B → 2E + D

The answer: C) 2A + B → 2E + D

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