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b in (-oo:+oo)
b/11-((4*b)/11) = 15/11 // - 15/11
b/11-((4*b)/11)-(15/11) = 0
b/11+(-4/11)*b-15/11 = 0
-3/11*b-15/11 = 0 // + 15/11
-3/11*b = 15/11 // : -3/11
b = 15/11/(-3/11)
b = -5
b = -5
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