800=40/X

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Solution for 800=40/X equation: 


D( X )

X = 0

X = 0

X = 0

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

800 = 40/X // - 40/X

800-(40/X) = 0

800-40*X^-1 = 0

-40*X^-1 = -800 // : -40

X^-1 = 20

-1 < 0

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

1 = 20*X^1 // : 20

1/20 = X^1

X = 1/20

X = 1/20

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