40/400=4/X

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Solution for 40/400=4/X equation: 


D( X )

X = 0

X = 0

X = 0

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

40/400 = 4/X // - 4/X

40/400-(4/X) = 0

40/400-4*X^-1 = 0

-4*X^-1 = -1/10 // : -4

X^-1 = 1/40

-1 < 0

1/(X^1) = 1/40 // * X^1

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

40 = X^1

X = 40

X = 40

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