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b in (-oo:+oo)
21/11 = 3-b-((1/3)*b) // - 3-b-((1/3)*b)
b+(1/3)*b+21/11-3 = 0
4/3*b-12/11 = 0 // + 12/11
4/3*b = 12/11 // : 4/3
b = 12/11/4/3
b = 9/11
b = 9/11
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