1040=400/x

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Solution for 1040=400/x equation: 


D( x )

x = 0

x = 0

x = 0

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

1040 = 400/x // - 400/x

1040-(400/x) = 0

1040-400*x^-1 = 0

-400*x^-1 = -1040 // : -400

x^-1 = 13/5

-1 < 0

1/(x^1) = 13/5 // * x^1

1 = 13/5*x^1 // : 13/5

5/13 = x^1

x = 5/13

x = 5/13

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