a/21=3

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Solution for a/21=3 equation: 


a in (-oo:+oo)

a/21 = 3 // - 3

a/21-3 = 0

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

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

a = 3/1/21

a = 63

a = 63

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