b-9=-69+7b

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Solution for b-9=-69+7b equation: 


b in (-oo:+oo)

b-9 = 7*b-69 // - 7*b-69

b-(7*b)-9+69 = 0

b-7*b-9+69 = 0

60-6*b = 0 // - 60

-6*b = -60 // : -6

b = -60/(-6)

b = 10

b = 10

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