18/21=25/x

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Solution for 18/21=25/x equation: 


D( x )

x = 0

x = 0

x = 0

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

18/21 = 25/x // - 25/x

18/21-(25/x) = 0

18/21-25*x^-1 = 0

-25*x^-1 = -6/7 // : -25

x^-1 = 6/175

-1 < 0

1/(x^1) = 6/175 // * x^1

1 = 6/175*x^1 // : 6/175

175/6 = x^1

x = 175/6

x = 175/6

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