$M, N$ are positive integers less than 10 and $8 M 420852 \times 9=N 9889788 \times 11$.
G7.1 Find $M$.
G7.2 Find $N$.
11 and 9 are relatively prime
$\Rightarrow 8 M 420852$ is divisible by 11
$\Rightarrow 8+4+0+5-(M+2+8+2)$ is divisible by 11
$\Rightarrow 5-M=11 k$
$$
\Rightarrow M=5
$$
$N 9889788$ is divisible by 9
$$
\begin{array}{l}
\Rightarrow N+9+8+8+9+7+8+8=9 t \\
\Rightarrow N=6
\end{array}
$$