b/(9+b*4)=1/13

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Solution for b/(9+b*4)=1/13 equation: 


D( b )

4*b+9 = 0

4*b+9 = 0

4*b+9 = 0

4*b+9 = 0 // - 9

4*b = -9 // : 4

b = -9/4

b in (-oo:-9/4) U (-9/4:+oo)

b/(4*b+9) = 1/13 // - 1/13

b/(4*b+9)-(1/13) = 0

b/(4*b+9)-1/13 = 0

(13*b)/(13*(4*b+9))+(-1*(4*b+9))/(13*(4*b+9)) = 0

13*b-1*(4*b+9) = 0

9*b-9 = 0

(9*b-9)/(13*(4*b+9)) = 0

(9*b-9)/(13*(4*b+9)) = 0 // * 13*(4*b+9)

9*b-9 = 0

9*b-9 = 0 // + 9

9*b = 9 // : 9

b = 9/9

b = 1

b = 1

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