Question

лог5(x+7)=лог5(5-х)-1​

Answer 1

Ответ:

$log_{5}(x + 7) = log_{5}(5 - x) - 1 \\ log(x + 7) = log(5 - x) - log(5) \\ \frac{5(x + 7)}{5 - x} = 1 \\ 5x + 35 = 5 - x \\ 6x = - 30 \\ x = - 5$