When working modulo $m$, the notation $a^{-1}$ is used to denote the residue $b$ for which $ab\equiv 1\pmod{m}$, if any exists. For how many integers $a$ satisfying $0 \le a < 100$ is it true that $a(a-1)^{-1} \equiv 4a^{-1} \pmod{20}$