9+4b=5b+21

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Solution for 9+4b=5b+21 equation: 


b in (-oo:+oo)

4*b+9 = 5*b+21 // - 5*b+21

4*b-(5*b)-21+9 = 0

4*b-5*b-21+9 = 0

-b-12 = 0 // + 12

-b = 12 // * -1

b = -12

b = -12

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