log216=x 2x=16 x=4 log2x=5 xlog2=log5 xlog2=log5 x=log5/log2 logx+log2-log(x+2)=0 log(2x)-log(x+2)=0 log(2x/x+2)=log1 2x/x+2=1 2x=x+2 x=2