7. Разность между максимальной и минимальной степенями окисления
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![Scott Joplin - The Entertainer (1902) [HQ]](https://sun9-47.userapi.com/OKeWsU_QrIBsbFaCq5dLVDoLXXjt7rmS20Kg9w/Q94NLUNWQDg.jpg)
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