30/27=90/x

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Solution for 30/27=90/x equation: 


D( x )

x = 0

x = 0

x = 0

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

30/27 = 90/x // - 90/x

30/27-(90/x) = 0

30/27-90*x^-1 = 0

-90*x^-1 = -10/9 // : -90

x^-1 = 1/81

-1 < 0

1/(x^1) = 1/81 // * x^1

1 = 1/81*x^1 // : 1/81

81 = x^1

x = 81

x = 81

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