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b in (-oo:+oo)
b/11-((6*b)/11) = 20/11 // - 20/11
b/11-((6*b)/11)-(20/11) = 0
b/11+(-6/11)*b-20/11 = 0
-5/11*b-20/11 = 0 // + 20/11
-5/11*b = 20/11 // : -5/11
b = 20/11/(-5/11)
b = -4
b = -4
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