3/7=x/9

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Solution for 3/7=x/9 equation: 


x in (-oo:+oo)

3/7 = x/9 // - x/9

3/7-(x/9) = 0

3/7-1/9*x = 0 // - 3/7

-1/9*x = -3/7 // : -1/9

x = -3/7/(-1/9)

x = 27/7

x = 27/7

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