28/4=21/n

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Solution for 28/4=21/n equation: 


D( n )

n = 0

n = 0

n = 0

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

28/4 = 21/n // - 21/n

28/4-(21/n) = 0

28/4-21*n^-1 = 0

-21*n^-1 = -7 // : -21

n^-1 = 1/3

-1 < 0

1/(n^1) = 1/3 // * n^1

1 = 1/3*n^1 // : 1/3

3 = n^1

n = 3

n = 3

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