400/x=20

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Solution for 400/x=20 equation: 


D( x )

x = 0

x = 0

x = 0

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

400/x = 20 // - 20

400/x-20 = 0

400*x^-1 = 20 // : 400

x^-1 = 1/20

-1 < 0

1/(x^1) = 1/20 // * x^1

1 = 1/20*x^1 // : 1/20

20 = x^1

x = 20

x = 20

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