80/20=10/x

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Solution for 80/20=10/x equation: 


D( x )

x = 0

x = 0

x = 0

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

80/20 = 10/x // - 10/x

80/20-(10/x) = 0

80/20-10*x^-1 = 0

-10*x^-1 = -4 // : -10

x^-1 = 2/5

-1 < 0

1/(x^1) = 2/5 // * x^1

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

5/2 = x^1

x = 5/2

x = 5/2

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