4=12/y

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Solution for 4=12/y equation: 


D( y )

y = 0

y = 0

y = 0

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

4 = 12/y // - 12/y

4-(12/y) = 0

4-12*y^-1 = 0

-12*y^-1 = -4 // : -12

y^-1 = 1/3

-1 < 0

1/(y^1) = 1/3 // * y^1

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

3 = y^1

y = 3

y = 3

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