4/b-5/7

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Solution for 4/b-5/7 equation: 


D( b )

b = 0

b = 0

b = 0

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

4/b-(5/7) = 0

4/b-5/7 = 0

4*b^-1 = 5/7 // : 4

b^-1 = 5/28

-1 < 0

1/(b^1) = 5/28 // * b^1

1 = 5/28*b^1 // : 5/28

28/5 = b^1

b = 28/5

b = 28/5

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