7.8/b=39/20

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Solution for 7.8/b=39/20 equation: 


D( b )

b = 0

b = 0

b = 0

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

7.8/b = 39/20 // - 39/20

7.8/b-(39/20) = 0

7.8/b-39/20 = 0

7.8*b^-1 = 39/20 // : 7.8

b^-1 = 0.25

-1 < 0

1/(b^1) = 0.25 // * b^1

1 = 0.25*b^1 // : 0.25

4 = b^1

b = 4

b = 4

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