3 . Divide the nine digits 1 - 9 into two groups: $1, 9, 8, 3$ and 2, 
$4, 5, 6, 7$, and fill them into the following equation to make it true:
$$
\frac{\square \square}{\square \square}=\frac{O+O+O}{O+O} \text {. }
$$