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b in (-oo:+oo)
b/11-((8*b)/11) = 28/11 // - 28/11
b/11-((8*b)/11)-(28/11) = 0
b/11+(-8/11)*b-28/11 = 0
-7/11*b-28/11 = 0 // + 28/11
-7/11*b = 28/11 // : -7/11
b = 28/11/(-7/11)
b = -4
b = -4
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