3/7=x/21

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Solution for 3/7=x/21 equation: 


x in (-oo:+oo)

3/7 = x/21 // - x/21

3/7-(x/21) = 0

3/7-1/21*x = 0 // - 3/7

-1/21*x = -3/7 // : -1/21

x = -3/7/(-1/21)

x = 9

x = 9

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