3/840=4/x

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Solution for 3/840=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/840 = 4/x // - 4/x

3/840-(4/x) = 0

3/840-4*x^-1 = 0

-4*x^-1 = -1/280 // : -4

x^-1 = 1/1120

-1 < 0

1/(x^1) = 1/1120 // * x^1

1 = 1/1120*x^1 // : 1/1120

1120 = x^1

x = 1120

x = 1120

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