3/7=a/21

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Solution for 3/7=a/21 equation: 


a in (-oo:+oo)

3/7 = a/21 // - a/21

3/7-(a/21) = 0

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

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

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

a = 9

a = 9

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