20/100=80/x

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Solution for 20/100=80/x equation: 


D( x )

x = 0

x = 0

x = 0

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

20/100 = 80/x // - 80/x

20/100-(80/x) = 0

20/100-80*x^-1 = 0

-80*x^-1 = -1/5 // : -80

x^-1 = 1/400

-1 < 0

1/(x^1) = 1/400 // * x^1

1 = 1/400*x^1 // : 1/400

400 = x^1

x = 400

x = 400

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