(5/7)=(x/21)

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Solution for (5/7)=(x/21) equation: 


x in (-oo:+oo)

5/7 = x/21 // - x/21

5/7-(x/21) = 0

5/7-1/21*x = 0 // - 5/7

-1/21*x = -5/7 // : -1/21

x = -5/7/(-1/21)

x = 15

x = 15

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