4=28/y

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Solution for 4=28/y equation: 


D( y )

y = 0

y = 0

y = 0

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

4 = 28/y // - 28/y

4-(28/y) = 0

4-28*y^-1 = 0

-28*y^-1 = -4 // : -28

y^-1 = 1/7

-1 < 0

1/(y^1) = 1/7 // * y^1

1 = 1/7*y^1 // : 1/7

7 = y^1

y = 7

y = 7

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