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In the group $G=\{1,2,3,4,5,6\}$ under $\otimes_{7}$, then the solution of $4 \otimes 7 x=5$ is
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The correct answer is:
3
By the properties of multiplication modulo,
$$
\begin{aligned}
&4 \otimes_{7} 3=5 \\
&4 \otimes_{7} 2=1 \\
&4 \otimes_{7} 4=2 \\
&4 \otimes_{7} 5=6
\end{aligned}
$$
$$
\begin{aligned}
&4 \otimes_{7} 3=5 \\
&4 \otimes_{7} 2=1 \\
&4 \otimes_{7} 4=2 \\
&4 \otimes_{7} 5=6
\end{aligned}
$$
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