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b in (-oo:+oo)
(1/3)*(9*b-39) = -9 // + 9
(1/3)*(9*b-39)+9 = 0
1/3*(9*b-39)+9 = 0
1/3*(9*b-39)+9 = 0
3*b-4 = 0
3*b-4 = 0
3*b-4 = 0 // + 4
3*b = 4 // : 3
b = 4/3
b = 4/3
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