I want to remove an entry in my $PATH
Look in ~/.profile, ~/.bashrc, ~/.bash_profile, /etc/bashrc for a line of the following form:

export PATH=$PATH:/Users/austinzuffi/Development/Android/adt-bundle-max-x86_64/sdk/tools


Also look to see if any of those files contain a line starting with either source or . (which is short for source). If they do then look in the sourced files too.

A quicker way might be to use grep. Open a terminal and, from your home directory run 

grep -r "/Users/austinzuffi/Development/Android/adt-bundle-max-x86_64/sdk/tools" .