400=200/y

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Solution for 400=200/y equation: 


D( y )

y = 0

y = 0

y = 0

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

400 = 200/y // - 200/y

400-(200/y) = 0

400-200*y^-1 = 0

-200*y^-1 = -400 // : -200

y^-1 = 2

-1 < 0

1/(y^1) = 2 // * y^1

1 = 2*y^1 // : 2

1/2 = y^1

y = 1/2

y = 1/2

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