18/12=81/x

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Solution for 18/12=81/x equation: 


D( x )

x = 0

x = 0

x = 0

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

18/12 = 81/x // - 81/x

18/12-(81/x) = 0

18/12-81*x^-1 = 0

-81*x^-1 = -3/2 // : -81

x^-1 = 1/54

-1 < 0

1/(x^1) = 1/54 // * x^1

1 = 1/54*x^1 // : 1/54

54 = x^1

x = 54

x = 54

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