b-9=4b-9

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Solution for b-9=4b-9 equation: 


b in (-oo:+oo)

b-9 = 4*b-9 // - 4*b-9

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

b-4*b-9+9 = 0

-3*b = 0 // : -3

b = 0

b = 0

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