21=3/8n

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Solution for 21=3/8n equation: 


n in (-oo:+oo)

21 = (3/8)*n // - (3/8)*n

21-((3/8)*n) = 0

(-3/8)*n+21 = 0

21-3/8*n = 0 // - 21

-3/8*n = -21 // : -3/8

n = -21/(-3/8)

n = 56

n = 56

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