8/20=12/x

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Solution for 8/20=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

8/20 = 12/x // - 12/x

8/20-(12/x) = 0

8/20-12*x^-1 = 0

-12*x^-1 = -2/5 // : -12

x^-1 = 1/30

-1 < 0

1/(x^1) = 1/30 // * x^1

1 = 1/30*x^1 // : 1/30

30 = x^1

x = 30

x = 30

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