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5. Уравнения \ Тип 2


\(\DeclareMathOperator{\tg}{tg}\)\(\DeclareMathOperator{\ctg}{ctg}\)\(\DeclareMathOperator{\arctg}{arctg}\)\(\DeclareMathOperator{\arcctg}{arcctg}\)
Найдите корень уравнения

\(27^{9x}=\left(\dfrac{1}{3}\right)^{-7x-7}\)