3/b=7/(8-b)

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Solution for 3/b=7/(8-b) equation: 


D( b )

b = 0

8-b = 0

b = 0

b = 0

8-b = 0

8-b = 0

8-b = 0 // - 8

-b = -8 // * -1

b = 8

b in (-oo:0) U (0:8) U (8:+oo)

3/b = 7/(8-b) // - 7/(8-b)

3/b-(7/(8-b)) = 0

3/b-7*(8-b)^-1 = 0

3/b-7/(8-b) = 0

(-7*b)/(b*(8-b))+(3*(8-b))/(b*(8-b)) = 0

3*(8-b)-7*b = 0

24-10*b = 0

(24-10*b)/(b*(8-b)) = 0

(24-10*b)/(b*(8-b)) = 0 // * b*(8-b)

24-10*b = 0

24-10*b = 0 // - 24

-10*b = -24 // : -10

b = -24/(-10)

b = 12/5

b = 12/5

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