9/10=21/x

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Solution for 9/10=21/x equation: 


D( x )

x = 0

x = 0

x = 0

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

9/10 = 21/x // - 21/x

9/10-(21/x) = 0

9/10-21*x^-1 = 0

-21*x^-1 = -9/10 // : -21

x^-1 = 3/70

-1 < 0

1/(x^1) = 3/70 // * x^1

1 = 3/70*x^1 // : 3/70

70/3 = x^1

x = 70/3

x = 70/3

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