Question

log5(9x-124)-1=log5 4

Answer 1

$log_5 (9x-124)-1=log_5 4;\ log_5 (9x-124)-log_5 5=log_5 4;\ log_5 frac{9x-124}{5}=log_5 4;\ frac{9x-124}{5}=4;\ 9x-124=4*5;\ 9x-124=20;\ 9x=124+20;\ 9x=144;\ x=frac{144}{9}=16$

ответ: 16