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Автор - arailym200791

14400/(270-х)+520=1200​

Ответ

Автор - selvik478gmailcom

14400/(270-х)+520=1200

14400/270-х+520=1200

14400/790-x = 1200 /× 790-x

14400=1200(790-x) /: 1200

12=790-x

x=790-12

x=778

Ответ: х=778

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