log8 (x+7)=log8 (2x-15) log1//2 (4-x)=-5 log1//3 (3-2x) -4 log1//3 (10-x)=-3 log2 (14-2x) 4 log2 3 log7 (3-x)=2 log7 4 log2 (10-5x)=3 log2 5

telman