Question 147927
{{{ln(y)-ln(y-4)=ln(2)}}}
{{{ln(y/(y-4))=ln(2)}}}
{{{y/(y-4)=2}}}
{{{y=2(y-4)}}}
{{{y=2y-8}}}
{{{-y=-8}}}
{{{y=8}}}
Check your answer.
{{{ln(y)-ln(y-4)=ln(2)}}}
{{{ln(8)-ln(8-4)=ln(2)}}}
{{{ln(y)-ln(4)=ln(2)}}}
{{{ln(8/4)=ln(2)}}}
{{{ln(2)=ln(2)}}}
True statement. 
Good answer.