# What do you do when your variable cancels out?

Suppose we're solving in $\setminus m a t h \boldsymbol{R}$
$0 x = 1 \setminus R i g h t a r r o w S = \setminus \emptyset$
$0 x = 0 \setminus R i g h t a r r o w S = \setminus m a t h \boldsymbol{R}$