Question 677512
ln(t)-ln(t-4)=1


ln(t/(t-4))=1


t/(t-4)=e^1


t/(t-4)=e


t=e(t-4)


t=et-4e


t-et = -4e


t(1-e) = -4e


t = -4e/(1-e)


So the solution is    t = -4e/(1-e)