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5. Уравнения \ Тип 2


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

\(7^{-4x+4}=\left(\dfrac{1}{49}\right)^{9x-2}\)