-42/6=21/n

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Solution for -42/6=21/n equation: 


D( n )

n = 0

n = 0

n = 0

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

-42/6 = 21/n // - 21/n

-(21/n)-42/6 = 0

-21*n^-1-42/6 = 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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