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b in (-oo:+oo)
9*b-((12/3)*b) = 3 // - 3
9*b-((12/3)*b)-3 = 0
9*b-4*b-3 = 0
5*b-3 = 0 // + 3
5*b = 3 // : 5
b = 3/5
b = 3/5
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