21=7n/(8-5)

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Solution for 21=7n/(8-5) equation: 


n in (-oo:+oo)

21 = (7*n)/(8-5) // - (7*n)/(8-5)

21-((7*n)/(8-5)) = 0

21-7*(8-5)^-1*n = 0

21-7/3*n = 0 // - 21

-7/3*n = -21 // : -7/3

n = -21/(-7/3)

n = 9

n = 9

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