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b in (-oo:+oo)
(1/3)*(9*b-27) = 3 // - 3
(1/3)*(9*b-27)-3 = 0
1/3*(9*b-27)-3 = 0
1/3*(9*b-27)-3 = 0
3*b-12 = 0
3*b-12 = 0
3*b-12 = 0 // + 12
3*b = 12 // : 3
b = 12/3
b = 4
b = 4
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