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b in (-oo:+oo)
(1/3)*(9*b-36) = 1 // - 1
(1/3)*(9*b-36)-1 = 0
1/3*(9*b-36)-1 = 0
1/3*(9*b-36)-1 = 0
3*b-13 = 0
3*b-13 = 0
3*b-13 = 0 // + 13
3*b = 13 // : 3
b = 13/3
b = 13/3
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