Ответы на вопрос:
Log₂(7x - 4) = 2 + log₂13 одз: 7x - 4 > 0 log₂(7x - 4) = log₂4 + log₂13 7x > 4 log₂(7x - 4) = log₂52 x > 4/7 7x - 4 = 52 7x = 52 + 4 7x = 56 x = 8
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