21/9=84/n

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Solution for 21/9=84/n equation: 


D( n )

n = 0

n = 0

n = 0

n in (-oo:0) U (0:+oo)

21/9 = 84/n // - 84/n

21/9-(84/n) = 0

21/9-84*n^-1 = 0

-84*n^-1 = -7/3 // : -84

n^-1 = 1/36

-1 < 0

1/(n^1) = 1/36 // * n^1

1 = 1/36*n^1 // : 1/36

36 = n^1

n = 36

n = 36

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