3=39/y

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Solution for 3=39/y equation: 


D( y )

y = 0

y = 0

y = 0

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

3 = 39/y // - 39/y

3-(39/y) = 0

3-39*y^-1 = 0

-39*y^-1 = -3 // : -39

y^-1 = 1/13

-1 < 0

1/(y^1) = 1/13 // * y^1

1 = 1/13*y^1 // : 1/13

13 = y^1

y = 13

y = 13

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