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b in (-oo:+oo)
(2/3)*(9*b-27) = 80 // - 80
(2/3)*(9*b-27)-80 = 0
2/3*(9*b-27)-80 = 0
2/3*(9*b-27)-80 = 0
6*b-98 = 0
6*b-98 = 0
6*b-98 = 0 // + 98
6*b = 98 // : 6
b = 98/6
b = 49/3
b = 49/3
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