Respuesta :

[tex]\begin{gathered} \frac{x}{12}=\frac{12}{72} \\ \text{cross multiply} \\ 72x=12\times12 \\ 72x=144 \\ \text{divide both sides by 72} \\ \frac{72x}{72}=\frac{144}{72} \\ x=\frac{144}{72} \\ x=2 \end{gathered}[/tex]

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