Root partition full

[Mastery <debomirou@googlemail.com>]

I have different partitions for / and /home.Unfortunately my root 
partition is full (7GB).What can i do now?
Shall i try repartitioning my root through boot disk  or there is any 
other way to clean the / partition. I don't know how a 7 GB / is full 
since all the applications are stored in my home partition