4=28/h

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Solution for 4=28/h equation: 


D( h )

h = 0

h = 0

h = 0

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

4 = 28/h // - 28/h

4-(28/h) = 0

4-28*h^-1 = 0

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

h^-1 = 1/7

-1 < 0

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

1 = 1/7*h^1 // : 1/7

7 = h^1

h = 7

h = 7

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