Question:
Given $m\geq 2$, denote by $b^{-1}$ the inverse of $b\pmod{m}$. That is, $b^{-1}$ is the residue for which $bb^{-1}\equiv 1\pmod{m}$. Sadie wonders if $(a+b)^{-1}$ is always congruent to $a^{-1}+b^{-1}$ (modulo $m$). She tries the example $a=2$, $b=3$, and $m=7$. Let $L$ be the residue of $(2+3)^{-1}\pmod{7}$, and let $R$ be the residue of $2^{-1}+3^{-1}\pmod{7}$, where $L$ and $R$ are integers from $0$ to $6$ (inclusive). Find $L-R$.

Answer:
The inverse of $5\pmod{7}$ is 3, since $5\cdot3 \equiv 1\pmod{7}$. Also, inverse of $2\pmod{7}$ is 4, since $2\cdot 4\equiv 1\pmod{7}$. Finally, the inverse of $3\pmod{7}$ is 5 (again because $5\cdot3 \equiv 1\pmod{7}$). So the residue of $2^{-1}+3^{-1}$ is the residue of $4+5\pmod{7}$, which is $2$. Thus $L-R=3-2=\boxed{1}$. Since the left-hand side $L$ and the right-hand side $R$ of the equation $$
(a+b)^{-1} \stackrel{?}{=} a^{-1} + b^{-1} \pmod{m}
$$are not equal, we may conclude that the equation is not true in general.