4=84/y

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Solution for 4=84/y equation: 


D( y )

y = 0

y = 0

y = 0

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

4 = 84/y // - 84/y

4-(84/y) = 0

4-84*y^-1 = 0

-84*y^-1 = -4 // : -84

y^-1 = 1/21

-1 < 0

1/(y^1) = 1/21 // * y^1

1 = 1/21*y^1 // : 1/21

21 = y^1

y = 21

y = 21

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