3 birds were sitting on the fence. 6 more storks and 2 more birds came to join them. How many more storks than birds are sitting on the fence?
et's denote the number of storks by $S$ and the number of birds by $B$. Then we have the following two equations:
$$
\begin{aligned}
2S &= B+5 \\
2B &= S+3
\end{aligned}
$$
We can solve this linear system of equations and get $S=4$, $B=2$. There are two more storks than birds.