For any number $x$, we are told that $x\&=7-x$ and $\&x = x -7$. What is the value of $\&(12\&)$?

Pls include steps not just answer

Thanks!

The & functions cancel, and you are left with 0.

We have &(12&)=&(7-12)=&(-5)= (-5-7)=-12