Resposta :
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ \frac{1}{x}=\frac{10}{70}} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ 10x=70} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{x=\frac{70}{10} } \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \boxed{\boxed{\sf{ x=7}}} \leftarrow \sf 4^a\,opc_{\!\!,}\tilde{a}o\end{gathered}$}[/tex]