x/21=3/7

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Solution for x/21=3/7 equation: 


x in (-oo:+oo)

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

x/21-(3/7) = 0

x/21-3/7 = 0

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

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

x = 3/7/1/21

x = 9

x = 9

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