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

18-3*b = 0 // - 18

-3*b = -18 // : -3

b = -18/(-3)

b = 6

b = 6

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