Respuesta :

Solve for x

[tex]\begin{gathered} \frac{5}{7}=\frac{x}{21} \\ 5\cdot21=7\cdot x \\ 105=7x \end{gathered}[/tex]

Divide both sides by 7

[tex]\begin{gathered} \frac{105}{7}=\frac{7x}{7} \\ x=15 \end{gathered}[/tex]

Answer: x = 15

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