4b+9=-5b+81

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Solution for 4b+9=-5b+81 equation: 


b in (-oo:+oo)

4*b+9 = 81-5*b // - 81-5*b

4*b-(-5*b)-81+9 = 0

4*b+5*b-81+9 = 0

9*b-72 = 0 // + 72

9*b = 72 // : 9

b = 72/9

b = 8

b = 8

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