80/1=100/x

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Solution for 80/1=100/x equation: 


D( x )

x = 0

x = 0

x = 0

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

80/1 = 100/x // - 100/x

80/1-(100/x) = 0

80-100*x^-1 = 0

-100*x^-1 = -80 // : -100

x^-1 = 4/5

-1 < 0

1/(x^1) = 4/5 // * x^1

1 = 4/5*x^1 // : 4/5

5/4 = x^1

x = 5/4

x = 5/4

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