13=5b-4b+9

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Solution for 13=5b-4b+9 equation: 


b in (-oo:+oo)

13 = 5*b-(4*b)+9 // - 5*b-(4*b)+9

4*b-(5*b)-9+13 = 0

4*b-5*b-9+13 = 0

4-b = 0 // - 4

-b = -4 // * -1

b = 4

b = 4

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