7/4=5/b

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Solution for 7/4=5/b equation: 


D( b )

b = 0

b = 0

b = 0

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

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

7/4-(5/b) = 0

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

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

b^-1 = 7/20

-1 < 0

1/(b^1) = 7/20 // * b^1

1 = 7/20*b^1 // : 7/20

20/7 = b^1

b = 20/7

b = 20/7

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