21=a/3

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Solution for 21=a/3 equation: 


a in (-oo:+oo)

21 = a/3 // - a/3

21-(a/3) = 0

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

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

a = -21/(-1/3)

a = 63

a = 63

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