7/-3=21/x

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Solution for 7/-3=21/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/(-3) = 21/x // - 21/x

7/(-3)-(21/x) = 0

7/(-3)-21*x^-1 = 0

-21*x^-1 = 7/3 // : -21

x^-1 = -1/9

-1 < 0

1/(x^1) = -1/9 // * x^1

1 = -1/9*x^1 // : -1/9

-9 = x^1

x = -9

x = -9

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