Find the unknown variable in the following. x/4=7/20

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Find the unknown variable in the following. x/4=7/20

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[tex] \frac{x}{4} = \frac{7}{20} \\ \\ 20x = 7 \times 4 \\ 20x = 28 \\ x = \frac{28}{20} \\ \\ x = \frac{7}{5} \: \: [/tex]