x/21=3/9

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Solution for x/21=3/9 equation: 


x in (-oo:+oo)

x/21 = 3/9 // - 3/9

x/21-(3/9) = 0

x/21-1/3 = 0

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

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

x = 1/3/1/21

x = 7

x = 7

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