7/4=5/b-4

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Solution for 7/4=5/b-4 equation: 


D( b )

b = 0

b = 0

b = 0

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

7/4 = 5/b-4 // - 5/b-4

7/4-(5/b)+4 = 0

7/4-5*b^-1+4 = 0

-5*b^-1 = -23/4 // : -5

b^-1 = 23/20

-1 < 0

1/(b^1) = 23/20 // * b^1

1 = 23/20*b^1 // : 23/20

20/23 = b^1

b = 20/23

b = 20/23

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