x/21=4/7

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Solution for x/21=4/7 equation: 


x in (-oo:+oo)

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

x/21-(4/7) = 0

x/21-4/7 = 0

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

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

x = 4/7/1/21

x = 12

x = 12

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