Cрочно!! log7(x-1) log7 x=log7 x

ОДЗ{x>0{x-1>0⇒x>1x∈(1;∞)log(7)(x-1*log(7)x-log(70x=0log(7)x*(log(7)(x-1)-1)=0log(7)x=0⇒x=1 ∉ОДЗlog(7)(x-1)=1x-1=7x=8