3=400/x

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Solution for 3=400/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3 = 400/x // - 400/x

3-(400/x) = 0

3-400*x^-1 = 0

-400*x^-1 = -3 // : -400

x^-1 = 3/400

-1 < 0

1/(x^1) = 3/400 // * x^1

1 = 3/400*x^1 // : 3/400

400/3 = x^1

x = 400/3

x = 400/3

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