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b in (-oo:+oo)
b/11-((5*b)/11) = 28/11 // - 28/11
b/11-((5*b)/11)-(28/11) = 0
b/11+(-5/11)*b-28/11 = 0
-4/11*b-28/11 = 0 // + 28/11
-4/11*b = 28/11 // : -4/11
b = 28/11/(-4/11)
b = -7
b = -7
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