4/7=x/21

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Solution for 4/7=x/21 equation: 


x in (-oo:+oo)

4/7 = x/21 // - x/21

4/7-(x/21) = 0

4/7-1/21*x = 0 // - 4/7

-1/21*x = -4/7 // : -1/21

x = -4/7/(-1/21)

x = 12

x = 12

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