Log5x*log5(x+1)-log5x=0
ОДЗ x>0 U x>-1 x∈(0;∞) log(5)x*(log(5)(x+1)-1)=0 log(5)x=0⇒x=1 log(5)(x+1)=1⇒x+1=5⇒x=4