Помогите,пожалуйста!
Использовав основное свойство дроби, найдите значение n :
[tex] \\ \\ \\ \\ \frac{3}{7} = \frac{n}{21} ; \frac{n}{39} = \frac{8}{13} ; \frac{5}{n} = \frac{30}{48} ; \frac{7}{9} = \frac{49}{n} [/tex]
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