21=a/4

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Solution for 21=a/4 equation: 


a in (-oo:+oo)

21 = a/4 // - a/4

21-(a/4) = 0

21-1/4*a = 0 // - 21

-1/4*a = -21 // : -1/4

a = -21/(-1/4)

a = 84

a = 84

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