So today i decided to post one of the problems here and see if i can get any help hoping that i do the same mistake every time . I will try to upload two images with the circuit and my futile attempt to solve it.( it is hand written and in many places i haven't put the volt or amp symbols but i hope you will be able to understand it)

http://prntscr.com/4fa06k

http://prntscr.com/4fa0mm

The answer is supposed to be 3*(1 - e^(-5t)) A

Thanks in advance for your help